includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         public function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61                 return $t == null ? null : new Article( $t );
  62         }
  63
  64         /**
  65          * Tell the page view functions that this view was redirected
  66          * from another page on the wiki.
  67          * @param $from Title object.
  68          */
  69         public function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * If this page is a redirect, get its target
  75          *
  76          * The target will be fetched from the redirect table if possible.
  77          * If this page doesn't have an entry there, call insertRedirect()
  78          * @return mixed Title object, or null if this page is not a redirect
  79          */
  80         public function getRedirectTarget() {
  81                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  82                         return null;
  83                 if( !is_null($this->mRedirectTarget) )
  84                         return $this->mRedirectTarget;
  85                 # Query the redirect table
  86                 $dbr = wfGetDB( DB_SLAVE );
  87                 $row = $dbr->selectRow( 'redirect',
  88                         array('rd_namespace', 'rd_title'),
  89                         array('rd_from' => $this->getID() ),
  90                         __METHOD__
  91                 );
  92                 if( $row ) {
  93                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  94                 }
  95                 # This page doesn't have an entry in the redirect table
  96                 return $this->mRedirectTarget = $this->insertRedirect();
  97         }
  98
  99         /**
 100          * Insert an entry for this page into the redirect table.
 101          *
 102          * Don't call this function directly unless you know what you're doing.
 103          * @return Title object
 104          */
 105         public function insertRedirect() {
 106                 $retval = Title::newFromRedirect( $this->getContent() );
 107                 if( !$retval ) {
 108                         return null;
 109                 }
 110                 $dbw = wfGetDB( DB_MASTER );
 111                 $dbw->replace( 'redirect', array('rd_from'),
 112                         array(
 113                                 'rd_from' => $this->getID(),
 114                                 'rd_namespace' => $retval->getNamespace(),
 115                                 'rd_title' => $retval->getDBKey()
 116                         ),
 117                         __METHOD__
 118                 );
 119                 return $retval;
 120         }
 121
 122         /**
 123          * Get the Title object this page redirects to
 124          *
 125          * @return mixed false, Title of in-wiki target, or string with URL
 126          */
 127         public function followRedirect() {
 128                 $text = $this->getContent();
 129                 return $this->followRedirectText( $text );
 130         }
 131
 132         /**
 133          * Get the Title object this text redirects to
 134          *
 135          * @return mixed false, Title of in-wiki target, or string with URL
 136          */
 137         public function followRedirectText( $text ) {
 138                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 139                 # process if title object is valid and not special:userlogout
 140                 if( $rt ) {
 141                         if( $rt->getInterwiki() != '' ) {
 142                                 if( $rt->isLocal() ) {
 143                                         // Offsite wikis need an HTTP redirect.
 144                                         //
 145                                         // This can be hard to reverse and may produce loops,
 146                                         // so they may be disabled in the site configuration.
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 158                                                 // rolleyes
 159                                         } else {
 160                                                 return $rt->getFullURL();
 161                                         }
 162                                 }
 163                                 return $rt;
 164                         }
 165                 }
 166                 // No or invalid redirect
 167                 return false;
 168         }
 169
 170         /**
 171          * get the title object of the article
 172          */
 173         public function getTitle() {
 174                 return $this->mTitle;
 175         }
 176
 177         /**
 178          * Clear the object
 179          * @private
 180          */
 181         public function clear() {
 182                 $this->mDataLoaded    = false;
 183                 $this->mContentLoaded = false;
 184
 185                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRedirectTarget = null; # Title object if set
 188                 $this->mUserText =
 189                 $this->mTimestamp = $this->mComment = '';
 190                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 191                 $this->mTouched = '19700101000000';
 192                 $this->mForUpdate = false;
 193                 $this->mIsRedirect = false;
 194                 $this->mRevIdFetched = 0;
 195                 $this->mRedirectUrl = false;
 196                 $this->mLatest = false;
 197                 $this->mPreparedEdit = false;
 198         }
 199
 200         /**
 201          * Note that getContent/loadContent do not follow redirects anymore.
 202          * If you need to fetch redirectable content easily, try
 203          * the shortcut in Article::followContent()
 204          *
 205          * @return Return the text of this revision
 206         */
 207         public function getContent() {
 208                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 209                 wfProfileIn( __METHOD__ );
 210                 if( $this->getID() === 0 ) {
 211                         # If this is a MediaWiki:x message, then load the messages
 212                         # and return the message value for x.
 213                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 214                                 # If this is a system message, get the default text.
 215                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 216                                 $wgMessageCache->loadAllMessages( $lang );
 217                                 $text = wfMsgGetKey( $message, false, $lang, false );
 218                                 if( wfEmptyMsg( $message, $text ) )
 219                                         $text = '';
 220                         } else {
 221                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 222                         }
 223                         wfProfileOut( __METHOD__ );
 224                         return $text;
 225                 } else {
 226                         $this->loadContent();
 227                         wfProfileOut( __METHOD__ );
 228                         return $this->mContent;
 229                 }
 230         }
 231
 232         /**
 233          * Get the text of the current revision. No side-effects...
 234          *
 235          * @return Return the text of the current revision
 236         */
 237         public function getRawText() {
 238                 // Check process cache for current revision
 239                 if( $this->mContentLoaded && $this->mOldId == 0 ) {
 240                         return $this->mContent;
 241                 }
 242                 $rev = Revision::newFromTitle( $this->mTitle );
 243                 $text = $rev ? $rev->getRawText() : false;
 244                 return $text;
 245         }
 246
 247         /**
 248          * This function returns the text of a section, specified by a number ($section).
 249          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 250          * the first section before any such heading (section 0).
 251          *
 252          * If a section contains subsections, these are also returned.
 253          *
 254          * @param $text String: text to look in
 255          * @param $section Integer: section number
 256          * @return string text of the requested section
 257          * @deprecated
 258          */
 259         public function getSection( $text, $section ) {
 260                 global $wgParser;
 261                 return $wgParser->getSection( $text, $section );
 262         }
 263
 264         /**
 265          * Get the text that needs to be saved in order to undo all revisions
 266          * between $undo and $undoafter. Revisions must belong to the same page,
 267          * must exist and must not be deleted
 268          * @param $undo Revision
 269          * @param $undoafter Revision Must be an earlier revision than $undo
 270          * @return mixed string on success, false on failure
 271          */
 272         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 273                 $undo_text = $undo->getText();
 274                 $undoafter_text = $undoafter->getText();
 275                 $cur_text = $this->getContent();
 276                 if ( $cur_text == $undo_text ) {
 277                         # No use doing a merge if it's just a straight revert.
 278                         return $undoafter_text;
 279                 }
 280                 $undone_text = '';
 281                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 282                         return false;
 283                 return $undone_text;
 284         }
 285
 286         /**
 287          * @return int The oldid of the article that is to be shown, 0 for the
 288          *             current revision
 289          */
 290         public function getOldID() {
 291                 if( is_null( $this->mOldId ) ) {
 292                         $this->mOldId = $this->getOldIDFromRequest();
 293                 }
 294                 return $this->mOldId;
 295         }
 296
 297         /**
 298          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 299          *
 300          * @return int The old id for the request
 301          */
 302         public function getOldIDFromRequest() {
 303                 global $wgRequest;
 304                 $this->mRedirectUrl = false;
 305                 $oldid = $wgRequest->getVal( 'oldid' );
 306                 if( isset( $oldid ) ) {
 307                         $oldid = intval( $oldid );
 308                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 309                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 310                                 if( $nextid  ) {
 311                                         $oldid = $nextid;
 312                                 } else {
 313                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 314                                 }
 315                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 316                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 317                                 if( $previd ) {
 318                                         $oldid = $previd;
 319                                 }
 320                         }
 321                 }
 322                 if( !$oldid ) {
 323                         $oldid = 0;
 324                 }
 325                 return $oldid;
 326         }
 327
 328         /**
 329          * Load the revision (including text) into this object
 330          */
 331         function loadContent() {
 332                 if( $this->mContentLoaded ) return;
 333                 wfProfileIn( __METHOD__ );
 334                 # Query variables :P
 335                 $oldid = $this->getOldID();
 336                 # Pre-fill content with error message so that if something
 337                 # fails we'll have something telling us what we intended.
 338                 $this->mOldId = $oldid;
 339                 $this->fetchContent( $oldid );
 340                 wfProfileOut( __METHOD__ );
 341         }
 342
 343
 344         /**
 345          * Fetch a page record with the given conditions
 346          * @param $dbr Database object
 347          * @param $conditions Array
 348          */
 349         protected function pageData( $dbr, $conditions ) {
 350                 $fields = array(
 351                                 'page_id',
 352                                 'page_namespace',
 353                                 'page_title',
 354                                 'page_restrictions',
 355                                 'page_counter',
 356                                 'page_is_redirect',
 357                                 'page_is_new',
 358                                 'page_random',
 359                                 'page_touched',
 360                                 'page_latest',
 361                                 'page_len',
 362                 );
 363                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 364                 $row = $dbr->selectRow(
 365                         'page',
 366                         $fields,
 367                         $conditions,
 368                         __METHOD__
 369                 );
 370                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 371                 return $row ;
 372         }
 373
 374         /**
 375          * @param $dbr Database object
 376          * @param $title Title object
 377          */
 378         public function pageDataFromTitle( $dbr, $title ) {
 379                 return $this->pageData( $dbr, array(
 380                         'page_namespace' => $title->getNamespace(),
 381                         'page_title'     => $title->getDBkey() ) );
 382         }
 383
 384         /**
 385          * @param $dbr Database
 386          * @param $id Integer
 387          */
 388         protected function pageDataFromId( $dbr, $id ) {
 389                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 390         }
 391
 392         /**
 393          * Set the general counter, title etc data loaded from
 394          * some source.
 395          *
 396          * @param $data Database row object or "fromdb"
 397          */
 398         public function loadPageData( $data = 'fromdb' ) {
 399                 if( $data === 'fromdb' ) {
 400                         $dbr = wfGetDB( DB_MASTER );
 401                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 402                 }
 403
 404                 $lc = LinkCache::singleton();
 405                 if( $data ) {
 406                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 407
 408                         $this->mTitle->mArticleID = $data->page_id;
 409
 410                         # Old-fashioned restrictions
 411                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 412
 413                         $this->mCounter     = $data->page_counter;
 414                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mIsRedirect  = $data->page_is_redirect;
 416                         $this->mLatest      = $data->page_latest;
 417                 } else {
 418                         if( is_object( $this->mTitle ) ) {
 419                                 $lc->addBadLinkObj( $this->mTitle );
 420                         }
 421                         $this->mTitle->mArticleID = 0;
 422                 }
 423
 424                 $this->mDataLoaded  = true;
 425         }
 426
 427         /**
 428          * Get text of an article from database
 429          * Does *NOT* follow redirects.
 430          * @param $oldid Int: 0 for whatever the latest revision is
 431          * @return string
 432          */
 433         function fetchContent( $oldid = 0 ) {
 434                 if( $this->mContentLoaded ) {
 435                         return $this->mContent;
 436                 }
 437
 438                 $dbr = wfGetDB( DB_MASTER );
 439
 440                 # Pre-fill content with error message so that if something
 441                 # fails we'll have something telling us what we intended.
 442                 $t = $this->mTitle->getPrefixedText();
 443                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 444                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 445
 446                 if( $oldid ) {
 447                         $revision = Revision::newFromId( $oldid );
 448                         if( is_null( $revision ) ) {
 449                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 450                                 return false;
 451                         }
 452                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 453                         if( !$data ) {
 454                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 455                                 return false;
 456                         }
 457                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 458                         $this->loadPageData( $data );
 459                 } else {
 460                         if( !$this->mDataLoaded ) {
 461                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 462                                 if( !$data ) {
 463                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 464                                         return false;
 465                                 }
 466                                 $this->loadPageData( $data );
 467                         }
 468                         $revision = Revision::newFromId( $this->mLatest );
 469                         if( is_null( $revision ) ) {
 470                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 471                                 return false;
 472                         }
 473                 }
 474
 475                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 476                 // We should instead work with the Revision object when we need it...
 477                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 478
 479                 $this->mUser      = $revision->getUser();
 480                 $this->mUserText  = $revision->getUserText();
 481                 $this->mComment   = $revision->getComment();
 482                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 483
 484                 $this->mRevIdFetched = $revision->getId();
 485                 $this->mContentLoaded = true;
 486                 $this->mRevision =& $revision;
 487
 488                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 489
 490                 return $this->mContent;
 491         }
 492
 493         /**
 494          * Read/write accessor to select FOR UPDATE
 495          *
 496          * @param $x Mixed: FIXME
 497          */
 498         public function forUpdate( $x = NULL ) {
 499                 return wfSetVar( $this->mForUpdate, $x );
 500         }
 501
 502         /**
 503          * Get the database which should be used for reads
 504          *
 505          * @return Database
 506          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 507          */
 508         function getDB() {
 509                 wfDeprecated( __METHOD__ );
 510                 return wfGetDB( DB_MASTER );
 511         }
 512
 513         /**
 514          * Get options for all SELECT statements
 515          *
 516          * @param $options Array: an optional options array which'll be appended to
 517          *                       the default
 518          * @return Array: options
 519          */
 520         protected function getSelectOptions( $options = '' ) {
 521                 if( $this->mForUpdate ) {
 522                         if( is_array( $options ) ) {
 523                                 $options[] = 'FOR UPDATE';
 524                         } else {
 525                                 $options = 'FOR UPDATE';
 526                         }
 527                 }
 528                 return $options;
 529         }
 530
 531         /**
 532          * @return int Page ID
 533          */
 534         public function getID() {
 535                 if( $this->mTitle ) {
 536                         return $this->mTitle->getArticleID();
 537                 } else {
 538                         return 0;
 539                 }
 540         }
 541
 542         /**
 543          * @return bool Whether or not the page exists in the database
 544          */
 545         public function exists() {
 546                 return $this->getId() > 0;
 547         }
 548
 549         /**
 550          * Check if this page is something we're going to be showing
 551          * some sort of sensible content for. If we return false, page
 552          * views (plain action=view) will return an HTTP 404 response,
 553          * so spiders and robots can know they're following a bad link.
 554          *
 555          * @return bool
 556          */
 557         public function hasViewableContent() {
 558                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 559         }
 560
 561         /**
 562          * @return int The view count for the page
 563          */
 564         public function getCount() {
 565                 if( -1 == $this->mCounter ) {
 566                         $id = $this->getID();
 567                         if( $id == 0 ) {
 568                                 $this->mCounter = 0;
 569                         } else {
 570                                 $dbr = wfGetDB( DB_SLAVE );
 571                                 $this->mCounter = $dbr->selectField( 'page',
 572                                         'page_counter',
 573                                         array( 'page_id' => $id ),
 574                                         __METHOD__,
 575                                         $this->getSelectOptions()
 576                                 );
 577                         }
 578                 }
 579                 return $this->mCounter;
 580         }
 581
 582         /**
 583          * Determine whether a page  would be suitable for being counted as an
 584          * article in the site_stats table based on the title & its content
 585          *
 586          * @param $text String: text to analyze
 587          * @return bool
 588          */
 589         public function isCountable( $text ) {
 590                 global $wgUseCommaCount;
 591
 592                 $token = $wgUseCommaCount ? ',' : '[[';
 593                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 594         }
 595
 596         /**
 597          * Tests if the article text represents a redirect
 598          *
 599          * @param $text String: FIXME
 600          * @return bool
 601          */
 602         public function isRedirect( $text = false ) {
 603                 if( $text === false ) {
 604                         if( $this->mDataLoaded ) {
 605                                 return $this->mIsRedirect;
 606                         }
 607                         // Apparently loadPageData was never called
 608                         $this->loadContent();
 609                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 610                 } else {
 611                         $titleObj = Title::newFromRedirect( $text );
 612                 }
 613                 return $titleObj !== NULL;
 614         }
 615
 616         /**
 617          * Returns true if the currently-referenced revision is the current edit
 618          * to this page (and it exists).
 619          * @return bool
 620          */
 621         public function isCurrent() {
 622                 # If no oldid, this is the current version.
 623                 if( $this->getOldID() == 0 ) {
 624                         return true;
 625                 }
 626                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 627         }
 628
 629         /**
 630          * Loads everything except the text
 631          * This isn't necessary for all uses, so it's only done if needed.
 632          */
 633         protected function loadLastEdit() {
 634                 if( -1 != $this->mUser )
 635                         return;
 636
 637                 # New or non-existent articles have no user information
 638                 $id = $this->getID();
 639                 if( 0 == $id ) return;
 640
 641                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 642                 if( !is_null( $this->mLastRevision ) ) {
 643                         $this->mUser      = $this->mLastRevision->getUser();
 644                         $this->mUserText  = $this->mLastRevision->getUserText();
 645                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 646                         $this->mComment   = $this->mLastRevision->getComment();
 647                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 648                         $this->mRevIdFetched = $this->mLastRevision->getId();
 649                 }
 650         }
 651
 652         public function getTimestamp() {
 653                 // Check if the field has been filled by ParserCache::get()
 654                 if( !$this->mTimestamp ) {
 655                         $this->loadLastEdit();
 656                 }
 657                 return wfTimestamp(TS_MW, $this->mTimestamp);
 658         }
 659
 660         public function getUser() {
 661                 $this->loadLastEdit();
 662                 return $this->mUser;
 663         }
 664
 665         public function getUserText() {
 666                 $this->loadLastEdit();
 667                 return $this->mUserText;
 668         }
 669
 670         public function getComment() {
 671                 $this->loadLastEdit();
 672                 return $this->mComment;
 673         }
 674
 675         public function getMinorEdit() {
 676                 $this->loadLastEdit();
 677                 return $this->mMinorEdit;
 678         }
 679
 680         /* Use this to fetch the rev ID used on page views */
 681         public function getRevIdFetched() {
 682                 $this->loadLastEdit();
 683                 return $this->mRevIdFetched;
 684         }
 685
 686         /**
 687          * @param $limit Integer: default 0.
 688          * @param $offset Integer: default 0.
 689          */
 690         public function getContributors($limit = 0, $offset = 0) {
 691                 # XXX: this is expensive; cache this info somewhere.
 692
 693                 $contribs = array();
 694                 $dbr = wfGetDB( DB_SLAVE );
 695                 $revTable = $dbr->tableName( 'revision' );
 696                 $userTable = $dbr->tableName( 'user' );
 697                 $user = $this->getUser();
 698                 $pageId = $this->getId();
 699
 700                 $hideBit = Revision::DELETED_USER; // username hidden?
 701
 702                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 703                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 704                         WHERE rev_page = $pageId
 705                         AND rev_user != $user
 706                         AND rev_deleted & $hideBit = 0
 707                         GROUP BY rev_user, rev_user_text, user_real_name
 708                         ORDER BY timestamp DESC";
 709
 710                 if($limit > 0)
 711                         $sql = $dbr->limitResult($sql, $limit, $offset);
 712
 713                 $sql .= ' '. $this->getSelectOptions();
 714
 715                 $res = $dbr->query($sql, __METHOD__ );
 716
 717                 return new UserArrayFromResult( $res );
 718         }
 719
 720         /**
 721          * This is the default action of the script: just view the page of
 722          * the given title.
 723         */
 724         public function view() {
 725                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 726                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 727                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 728                 global $wgDefaultRobotPolicy;
 729
 730                 # Let the parser know if this is the printable version
 731                 if( $wgOut->isPrintable() ) {
 732                         $wgOut->parserOptions()->setIsPrintable( true );
 733                 }
 734
 735                 wfProfileIn( __METHOD__ );
 736
 737                 # Get variables from query string
 738                 $oldid = $this->getOldID();
 739
 740                 # Try client and file cache
 741                 if( $oldid === 0 && $this->checkTouched() ) {
 742                         global $wgUseETag;
 743                         if( $wgUseETag ) {
 744                                 $parserCache = ParserCache::singleton();
 745                                 $wgOut->setETag( $parserCache->getETag($this, $wgOut->parserOptions()) );
 746                         }
 747                         # Is is client cached?
 748                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 749                                 wfProfileOut( __METHOD__ );
 750                                 return;
 751                         # Try file cache
 752                         } else if( $this->tryFileCache() ) {
 753                                 # tell wgOut that output is taken care of
 754                                 $wgOut->disable();
 755                                 $this->viewUpdates();
 756                                 wfProfileOut( __METHOD__ );
 757                                 return;
 758                         }
 759                 }
 760
 761                 $ns = $this->mTitle->getNamespace(); # shortcut
 762                 $sk = $wgUser->getSkin();
 763
 764                 # getOldID may want us to redirect somewhere else
 765                 if( $this->mRedirectUrl ) {
 766                         $wgOut->redirect( $this->mRedirectUrl );
 767                         wfProfileOut( __METHOD__ );
 768                         return;
 769                 }
 770
 771                 $diff = $wgRequest->getVal( 'diff' );
 772                 $rcid = $wgRequest->getVal( 'rcid' );
 773                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 774                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 775                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 776                 $return404 = false;
 777
 778                 $wgOut->setArticleFlag( true );
 779
 780                 # Discourage indexing of printable versions, but encourage following
 781                 if( $wgOut->isPrintable() ) {
 782                         $policy = 'noindex,follow';
 783                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 784                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 785                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 786                         # Honour customised robot policies for this namespace
 787                         $policy = $wgNamespaceRobotPolicies[$ns];
 788                 } else {
 789                         $policy = $wgDefaultRobotPolicy;
 790                 }
 791                 $wgOut->setRobotPolicy( $policy );
 792
 793                 # Allow admins to see deleted content if explicitly requested
 794                 $delId = $diff ? $diff : $oldid;
 795                 $unhide = $wgRequest->getInt('unhide') == 1
 796                         && $wgUser->matchEditToken( $wgRequest->getVal('token'), $delId );
 797                 # If we got diff and oldid in the query, we want to see a
 798                 # diff page instead of the article.
 799                 if( !is_null( $diff ) ) {
 800                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 801
 802                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 803                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 804                         // DifferenceEngine directly fetched the revision:
 805                         $this->mRevIdFetched = $de->mNewid;
 806                         $de->showDiffPage( $diffOnly );
 807
 808                         // Needed to get the page's current revision
 809                         $this->loadPageData();
 810                         if( $diff == 0 || $diff == $this->mLatest ) {
 811                                 # Run view updates for current revision only
 812                                 $this->viewUpdates();
 813                         }
 814                         wfProfileOut( __METHOD__ );
 815                         return;
 816                 }
 817
 818                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
 819                         # User/User_talk subpages are not modified. (bug 11443)
 820                         if( !$this->mTitle->isSubpage() ) {
 821                                 $block = new Block();
 822                                 if( $block->load( $this->mTitle->getBaseText() ) ) {
 823                                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 824                                 }
 825                         }
 826                 }
 827
 828                 # Should the parser cache be used?
 829                 $pcache = $this->useParserCache( $oldid );
 830                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 831                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 832                         wfIncrStats( 'pcache_miss_stub' );
 833                 }
 834
 835                 $wasRedirected = false;
 836                 if( isset( $this->mRedirectedFrom ) ) {
 837                         // This is an internally redirected page view.
 838                         // We'll need a backlink to the source page for navigation.
 839                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 840                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 841                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 842                                 $wgOut->setSubtitle( $s );
 843
 844                                 // Set the fragment if one was specified in the redirect
 845                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 846                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 847                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 848                                 }
 849
 850                                 // Add a <link rel="canonical"> tag
 851                                 $wgOut->addLink( array( 'rel' => 'canonical',
 852                                         'href' => $this->mTitle->getLocalURL() )
 853                                 );
 854                                 $wasRedirected = true;
 855                         }
 856                 } elseif( !empty( $rdfrom ) ) {
 857                         // This is an externally redirected view, from some other wiki.
 858                         // If it was reported from a trusted site, supply a backlink.
 859                         global $wgRedirectSources;
 860                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 861                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 862                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 863                                 $wgOut->setSubtitle( $s );
 864                                 $wasRedirected = true;
 865                         }
 866                 }
 867
 868                 # Allow a specific header on talk pages, like [[MediaWiki:Talkpagetext]]
 869                 if( $this->mTitle->isTalkPage() ) {
 870                         $msg = wfMsgNoTrans( 'talkpageheader' );
 871                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
 872                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
 873                         }
 874                 }
 875
 876                 $outputDone = false;
 877                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 878                 if( $pcache && $wgOut->tryParserCache( $this ) ) {
 879                         // Ensure that UI elements requiring revision ID have
 880                         // the correct version information.
 881                         $wgOut->setRevisionId( $this->mLatest );
 882                         $outputDone = true;
 883                 }
 884                 # Fetch content and check for errors
 885                 if( !$outputDone ) {
 886                         # If the article does not exist and was deleted/moved, show the log
 887                         if( $this->getID() == 0 ) {
 888                                 $this->showLogs();
 889                         }
 890                         $text = $this->getContent();
 891                         // For now, check also for ID until getContent actually returns
 892                         // false for pages that do not exists
 893                         if( $text === false || $this->getID() === 0 ) {
 894                                 # Failed to load, replace text with error message
 895                                 $t = $this->mTitle->getPrefixedText();
 896                                 if( $oldid ) {
 897                                         $d = wfMsgExt( 'missingarticle-rev', 'escape', $oldid );
 898                                         $text = wfMsgExt( 'missing-article', 'parsemag', $t, $d );
 899                                 // Always use page content for pages in the MediaWiki namespace
 900                                 // since it contains the default message
 901                                 } elseif ( $this->mTitle->getNamespace() != NS_MEDIAWIKI ) {
 902                                         $text = wfMsgExt( 'noarticletext', 'parsemag' );
 903                                 }
 904                         }
 905
 906                         # Non-existent pages
 907                         if( $this->getID() === 0 ) {
 908                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 909                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 910                                 if( !$this->hasViewableContent() ) {
 911                                         // If there's no backing content, send a 404 Not Found
 912                                         // for better machine handling of broken links.
 913                                         $return404 = true;
 914                                 }
 915                         }
 916
 917                         if( $return404 ) {
 918                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 919                         }
 920
 921                         # Another whitelist check in case oldid is altering the title
 922                         if( !$this->mTitle->userCanRead() ) {
 923                                 $wgOut->loginToUse();
 924                                 $wgOut->output();
 925                                 $wgOut->disable();
 926                                 wfProfileOut( __METHOD__ );
 927                                 return;
 928                         }
 929
 930                         # For ?curid=x urls, disallow indexing
 931                         if( $wgRequest->getInt('curid') )
 932                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 933
 934                         # We're looking at an old revision
 935                         if( !empty( $oldid ) ) {
 936                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 937                                 if( is_null( $this->mRevision ) ) {
 938                                         // FIXME: This would be a nice place to load the 'no such page' text.
 939                                 } else {
 940                                         $this->setOldSubtitle( $oldid );
 941                                         # Allow admins to see deleted content if explicitly requested
 942                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 943                                                 // If the user is not allowed to see it...
 944                                                 if( !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
 945                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 946                                                                 'rev-deleted-text-permission' );
 947                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 948                                                         wfProfileOut( __METHOD__ );
 949                                                         return;
 950                                                 // If the user needs to confirm that they want to see it...
 951                                                 } else if( !$unhide ) {
 952                                                         # Give explanation and add a link to view the revision...
 953                                                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}".
 954                                                                 '&unhide=1&token='.urlencode( $wgUser->editToken($oldid) ) );
 955                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 956                                                                 array('rev-deleted-text-unhide',$link) );
 957                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 958                                                         wfProfileOut( __METHOD__ );
 959                                                         return;
 960                                                 // We are allowed to see...
 961                                                 } else {
 962                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 963                                                                 'rev-deleted-text-view' );
 964                                                 }
 965                                         }
 966                                         // Is this the current revision and otherwise cacheable? Try the parser cache...
 967                                         if( $oldid === $this->getLatest() && $this->useParserCache( false )
 968                                                 && $wgOut->tryParserCache( $this ) )
 969                                         {
 970                                                 $outputDone = true;
 971                                         }
 972                                 }
 973                         }
 974
 975                         // Ensure that UI elements requiring revision ID have
 976                         // the correct version information.
 977                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 978
 979                         if( $outputDone ) {
 980                                 // do nothing...
 981                         // Pages containing custom CSS or JavaScript get special treatment
 982                         } else if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 983                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 984                                 // Give hooks a chance to customise the output
 985                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 986                                         // Wrap the whole lot in a <pre> and don't parse
 987                                         $m = array();
 988                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 989                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 990                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 991                                         $wgOut->addHTML( "\n</pre>\n" );
 992                                 }
 993                         } else if( $rt = Title::newFromRedirectArray( $text ) ) { # get an array of redirect targets
 994                                 # Don't append the subtitle if this was an old revision
 995                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 996                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 997                                 $wgOut->addParserOutputNoText( $parseout );
 998                         } else if( $pcache ) {
 999                                 # Display content and save to parser cache
1000                                 $this->outputWikiText( $text );
1001                         } else {
1002                                 # Display content, don't attempt to save to parser cache
1003                                 # Don't show section-edit links on old revisions... this way lies madness.
1004                                 if( !$this->isCurrent() ) {
1005                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
1006                                 }
1007                                 # Display content and don't save to parser cache
1008                                 # With timing hack -- TS 2006-07-26
1009                                 $time = -wfTime();
1010                                 $this->outputWikiText( $text, false );
1011                                 $time += wfTime();
1012
1013                                 # Timing hack
1014                                 if( $time > 3 ) {
1015                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1016                                                 $this->mTitle->getPrefixedDBkey()));
1017                                 }
1018
1019                                 if( !$this->isCurrent() ) {
1020                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
1021                                 }
1022                         }
1023                 }
1024                 /* title may have been set from the cache */
1025                 $t = $wgOut->getPageTitle();
1026                 if( empty( $t ) ) {
1027                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1028
1029                         # For the main page, overwrite the <title> element with the con-
1030                         # tents of 'pagetitle-view-mainpage' instead of the default (if
1031                         # that's not empty).
1032                         if( $this->mTitle->equals( Title::newMainPage() ) &&
1033                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
1034                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
1035                         }
1036                 }
1037
1038                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1039                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1040                         $wgOut->addWikiMsg('anontalkpagetext');
1041                 }
1042
1043                 # If we have been passed an &rcid= parameter, we want to give the user a
1044                 # chance to mark this new article as patrolled.
1045                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->quickUserCan('patrol') ) {
1046                         $wgOut->addHTML(
1047                                 "<div class='patrollink'>" .
1048                                         wfMsgHtml( 'markaspatrolledlink',
1049                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
1050                                                 "action=markpatrolled&rcid=$rcid" )
1051                                         ) .
1052                                 '</div>'
1053                          );
1054                 }
1055
1056                 # Trackbacks
1057                 if( $wgUseTrackbacks ) {
1058                         $this->addTrackbacks();
1059                 }
1060
1061                 $this->viewUpdates();
1062                 wfProfileOut( __METHOD__ );
1063         }
1064
1065         protected function showLogs() {
1066                 global $wgUser, $wgOut;
1067                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1068                 $pager = new LogPager( $loglist, array('move', 'delete'), false, $this->mTitle->getPrefixedText() );
1069                 if( $pager->getNumRows() > 0 ) {
1070                         $pager->mLimit = 10;
1071                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1072                         $wgOut->addWikiMsg( 'moveddeleted-notice' );
1073                         $wgOut->addHTML(
1074                                 $loglist->beginLogEventsList() .
1075                                 $pager->getBody() .
1076                                 $loglist->endLogEventsList()
1077                         );
1078                         if( $pager->getNumRows() > 10 ) {
1079                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1080                                         SpecialPage::getTitleFor( 'Log' ),
1081                                         wfMsgHtml( 'log-fulllog' ),
1082                                         array(),
1083                                         array( 'page' => $this->mTitle->getPrefixedText() )
1084                                 ) );
1085                         }
1086                         $wgOut->addHTML( '</div>' );
1087                 }
1088         }
1089
1090         /*
1091         * Should the parser cache be used?
1092         */
1093         protected function useParserCache( $oldid ) {
1094                 global $wgUser, $wgEnableParserCache;
1095
1096                 return $wgEnableParserCache
1097                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1098                         && $this->exists()
1099                         && empty( $oldid )
1100                         && !$this->mTitle->isCssOrJsPage()
1101                         && !$this->mTitle->isCssJsSubpage();
1102         }
1103
1104         /**
1105          * View redirect
1106          * @param $target Title object or Array of destination(s) to redirect
1107          * @param $appendSubtitle Boolean [optional]
1108          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1109          */
1110         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1111                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1112                 # Display redirect
1113                 if( !is_array( $target ) ) {
1114                         $target = array( $target );
1115                 }
1116                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1117                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1118                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1119                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1120
1121                 if( $appendSubtitle ) {
1122                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1123                 }
1124                 $sk = $wgUser->getSkin();
1125                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1126                 $title = array_shift( $target );
1127                 if( $forceKnown ) {
1128                         $link = $sk->makeKnownLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1129                 } else {
1130                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1131                 }
1132                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1133                 foreach( $target as $rt ) {
1134                         if( $forceKnown ) {
1135                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1136                                         . $sk->makeKnownLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1137                         } else {
1138                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1139                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1140                         }
1141                 }
1142                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1143                         '<span class="redirectText">'.$link.'</span>';
1144
1145         }
1146
1147         public function addTrackbacks() {
1148                 global $wgOut, $wgUser;
1149                 $dbr = wfGetDB( DB_SLAVE );
1150                 $tbs = $dbr->select( 'trackbacks',
1151                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1152                         array('tb_page' => $this->getID() )
1153                 );
1154                 if( !$dbr->numRows($tbs) ) return;
1155
1156                 $tbtext = "";
1157                 while( $o = $dbr->fetchObject($tbs) ) {
1158                         $rmvtxt = "";
1159                         if( $wgUser->isAllowed( 'trackback' ) ) {
1160                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1161                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1162                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1163                         }
1164                         $tbtext .= "\n";
1165                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1166                                         $o->tb_title,
1167                                         $o->tb_url,
1168                                         $o->tb_ex,
1169                                         $o->tb_name,
1170                                         $rmvtxt);
1171                 }
1172                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1173                 $this->mTitle->invalidateCache();
1174         }
1175
1176         public function deletetrackback() {
1177                 global $wgUser, $wgRequest, $wgOut;
1178                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1179                         $wgOut->addWikiMsg( 'sessionfailure' );
1180                         return;
1181                 }
1182
1183                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1184                 if( count($permission_errors) ) {
1185                         $wgOut->showPermissionsErrorPage( $permission_errors );
1186                         return;
1187                 }
1188
1189                 $db = wfGetDB( DB_MASTER );
1190                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1191
1192                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1193                 $this->mTitle->invalidateCache();
1194         }
1195
1196         public function render() {
1197                 global $wgOut;
1198                 $wgOut->setArticleBodyOnly(true);
1199                 $this->view();
1200         }
1201
1202         /**
1203          * Handle action=purge
1204          */
1205         public function purge() {
1206                 global $wgUser, $wgRequest, $wgOut;
1207                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1208                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1209                                 $this->doPurge();
1210                                 $this->view();
1211                         }
1212                 } else {
1213                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1214                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1215                         $form = "<form method=\"post\" action=\"$action\">\n" .
1216                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1217                                         "</form>\n";
1218                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1219                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1220                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1221                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1222                         $wgOut->addHTML( $top . $form . $bottom );
1223                 }
1224         }
1225
1226         /**
1227          * Perform the actions of a page purging
1228          */
1229         public function doPurge() {
1230                 global $wgUseSquid;
1231                 // Invalidate the cache
1232                 $this->mTitle->invalidateCache();
1233
1234                 if( $wgUseSquid ) {
1235                         // Commit the transaction before the purge is sent
1236                         $dbw = wfGetDB( DB_MASTER );
1237                         $dbw->immediateCommit();
1238
1239                         // Send purge
1240                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1241                         $update->doUpdate();
1242                 }
1243                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1244                         global $wgMessageCache;
1245                         if( $this->getID() == 0 ) {
1246                                 $text = false;
1247                         } else {
1248                                 $text = $this->getRawText();
1249                         }
1250                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1251                 }
1252         }
1253
1254         /**
1255          * Insert a new empty page record for this article.
1256          * This *must* be followed up by creating a revision
1257          * and running $this->updateToLatest( $rev_id );
1258          * or else the record will be left in a funky state.
1259          * Best if all done inside a transaction.
1260          *
1261          * @param $dbw Database
1262          * @return int The newly created page_id key, or false if the title already existed
1263          * @private
1264          */
1265         public function insertOn( $dbw ) {
1266                 wfProfileIn( __METHOD__ );
1267
1268                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1269                 $dbw->insert( 'page', array(
1270                         'page_id'           => $page_id,
1271                         'page_namespace'    => $this->mTitle->getNamespace(),
1272                         'page_title'        => $this->mTitle->getDBkey(),
1273                         'page_counter'      => 0,
1274                         'page_restrictions' => '',
1275                         'page_is_redirect'  => 0, # Will set this shortly...
1276                         'page_is_new'       => 1,
1277                         'page_random'       => wfRandom(),
1278                         'page_touched'      => $dbw->timestamp(),
1279                         'page_latest'       => 0, # Fill this in shortly...
1280                         'page_len'          => 0, # Fill this in shortly...
1281                 ), __METHOD__, 'IGNORE' );
1282
1283                 $affected = $dbw->affectedRows();
1284                 if( $affected ) {
1285                         $newid = $dbw->insertId();
1286                         $this->mTitle->resetArticleId( $newid );
1287                 }
1288                 wfProfileOut( __METHOD__ );
1289                 return $affected ? $newid : false;
1290         }
1291
1292         /**
1293          * Update the page record to point to a newly saved revision.
1294          *
1295          * @param $dbw Database object
1296          * @param $revision Revision: For ID number, and text used to set
1297                             length and redirect status fields
1298          * @param $lastRevision Integer: if given, will not overwrite the page field
1299          *                      when different from the currently set value.
1300          *                      Giving 0 indicates the new page flag should be set
1301          *                      on.
1302          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1303          *                                                       removing rows in redirect table.
1304          * @return bool true on success, false on failure
1305          * @private
1306          */
1307         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1308                 wfProfileIn( __METHOD__ );
1309
1310                 $text = $revision->getText();
1311                 $rt = Title::newFromRedirect( $text );
1312
1313                 $conditions = array( 'page_id' => $this->getId() );
1314                 if( !is_null( $lastRevision ) ) {
1315                         # An extra check against threads stepping on each other
1316                         $conditions['page_latest'] = $lastRevision;
1317                 }
1318
1319                 $dbw->update( 'page',
1320                         array( /* SET */
1321                                 'page_latest'      => $revision->getId(),
1322                                 'page_touched'     => $dbw->timestamp(),
1323                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1324                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1325                                 'page_len'         => strlen( $text ),
1326                         ),
1327                         $conditions,
1328                         __METHOD__ );
1329
1330                 $result = $dbw->affectedRows() != 0;
1331                 if( $result ) {
1332                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1333                 }
1334
1335                 wfProfileOut( __METHOD__ );
1336                 return $result;
1337         }
1338
1339         /**
1340          * Add row to the redirect table if this is a redirect, remove otherwise.
1341          *
1342          * @param $dbw Database
1343          * @param $redirectTitle a title object pointing to the redirect target,
1344          *                                               or NULL if this is not a redirect
1345          * @param $lastRevIsRedirect If given, will optimize adding and
1346          *                                                       removing rows in redirect table.
1347          * @return bool true on success, false on failure
1348          * @private
1349          */
1350         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1351                 // Always update redirects (target link might have changed)
1352                 // Update/Insert if we don't know if the last revision was a redirect or not
1353                 // Delete if changing from redirect to non-redirect
1354                 $isRedirect = !is_null($redirectTitle);
1355                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1356                         wfProfileIn( __METHOD__ );
1357                         if( $isRedirect ) {
1358                                 // This title is a redirect, Add/Update row in the redirect table
1359                                 $set = array( /* SET */
1360                                         'rd_namespace' => $redirectTitle->getNamespace(),
1361                                         'rd_title'     => $redirectTitle->getDBkey(),
1362                                         'rd_from'      => $this->getId(),
1363                                 );
1364                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1365                         } else {
1366                                 // This is not a redirect, remove row from redirect table
1367                                 $where = array( 'rd_from' => $this->getId() );
1368                                 $dbw->delete( 'redirect', $where, __METHOD__);
1369                         }
1370                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1371                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1372                         }
1373                         wfProfileOut( __METHOD__ );
1374                         return ( $dbw->affectedRows() != 0 );
1375                 }
1376                 return true;
1377         }
1378
1379         /**
1380          * If the given revision is newer than the currently set page_latest,
1381          * update the page record. Otherwise, do nothing.
1382          *
1383          * @param $dbw Database object
1384          * @param $revision Revision object
1385          */
1386         public function updateIfNewerOn( &$dbw, $revision ) {
1387                 wfProfileIn( __METHOD__ );
1388                 $row = $dbw->selectRow(
1389                         array( 'revision', 'page' ),
1390                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1391                         array(
1392                                 'page_id' => $this->getId(),
1393                                 'page_latest=rev_id' ),
1394                         __METHOD__ );
1395                 if( $row ) {
1396                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1397                                 wfProfileOut( __METHOD__ );
1398                                 return false;
1399                         }
1400                         $prev = $row->rev_id;
1401                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1402                 } else {
1403                         # No or missing previous revision; mark the page as new
1404                         $prev = 0;
1405                         $lastRevIsRedirect = null;
1406                 }
1407                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1408                 wfProfileOut( __METHOD__ );
1409                 return $ret;
1410         }
1411
1412         /**
1413          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1414          * @return string Complete article text, or null if error
1415          */
1416         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1417                 wfProfileIn( __METHOD__ );
1418                 if( strval( $section ) == '' ) {
1419                         // Whole-page edit; let the whole text through
1420                 } else {
1421                         if( is_null($edittime) ) {
1422                                 $rev = Revision::newFromTitle( $this->mTitle );
1423                         } else {
1424                                 $dbw = wfGetDB( DB_MASTER );
1425                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1426                         }
1427                         if( !$rev ) {
1428                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1429                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1430                                 return null;
1431                         }
1432                         $oldtext = $rev->getText();
1433
1434                         if( $section == 'new' ) {
1435                                 # Inserting a new section
1436                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1437                                 $text = strlen( trim( $oldtext ) ) > 0
1438                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1439                                                 : "{$subject}{$text}";
1440                         } else {
1441                                 # Replacing an existing section; roll out the big guns
1442                                 global $wgParser;
1443                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1444                         }
1445                 }
1446                 wfProfileOut( __METHOD__ );
1447                 return $text;
1448         }
1449
1450         /**
1451          * @deprecated use Article::doEdit()
1452          */
1453         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1454                 wfDeprecated( __METHOD__ );
1455                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1456                         ( $isminor ? EDIT_MINOR : 0 ) |
1457                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1458                         ( $bot ? EDIT_FORCE_BOT : 0 );
1459
1460                 # If this is a comment, add the summary as headline
1461                 if( $comment && $summary != "" ) {
1462                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1463                 }
1464
1465                 $this->doEdit( $text, $summary, $flags );
1466
1467                 $dbw = wfGetDB( DB_MASTER );
1468                 if($watchthis) {
1469                         if(!$this->mTitle->userIsWatching()) {
1470                                 $dbw->begin();
1471                                 $this->doWatch();
1472                                 $dbw->commit();
1473                         }
1474                 } else {
1475                         if( $this->mTitle->userIsWatching() ) {
1476                                 $dbw->begin();
1477                                 $this->doUnwatch();
1478                                 $dbw->commit();
1479                         }
1480                 }
1481                 $this->doRedirect( $this->isRedirect( $text ) );
1482         }
1483
1484         /**
1485          * @deprecated use Article::doEdit()
1486          */
1487         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1488                 wfDeprecated( __METHOD__ );
1489                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1490                         ( $minor ? EDIT_MINOR : 0 ) |
1491                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1492
1493                 $status = $this->doEdit( $text, $summary, $flags );
1494                 if( !$status->isOK() ) {
1495                         return false;
1496                 }
1497
1498                 $dbw = wfGetDB( DB_MASTER );
1499                 if( $watchthis ) {
1500                         if(!$this->mTitle->userIsWatching()) {
1501                                 $dbw->begin();
1502                                 $this->doWatch();
1503                                 $dbw->commit();
1504                         }
1505                 } else {
1506                         if( $this->mTitle->userIsWatching() ) {
1507                                 $dbw->begin();
1508                                 $this->doUnwatch();
1509                                 $dbw->commit();
1510                         }
1511                 }
1512
1513                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1514                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1515
1516                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1517                 return true;
1518         }
1519
1520         /**
1521          * Article::doEdit()
1522          *
1523          * Change an existing article or create a new article. Updates RC and all necessary caches,
1524          * optionally via the deferred update array.
1525          *
1526          * $wgUser must be set before calling this function.
1527          *
1528          * @param $text String: new text
1529          * @param $summary String: edit summary
1530          * @param $flags Integer bitfield:
1531          *      EDIT_NEW
1532          *          Article is known or assumed to be non-existent, create a new one
1533          *      EDIT_UPDATE
1534          *          Article is known or assumed to be pre-existing, update it
1535          *      EDIT_MINOR
1536          *          Mark this edit minor, if the user is allowed to do so
1537          *      EDIT_SUPPRESS_RC
1538          *          Do not log the change in recentchanges
1539          *      EDIT_FORCE_BOT
1540          *          Mark the edit a "bot" edit regardless of user rights
1541          *      EDIT_DEFER_UPDATES
1542          *          Defer some of the updates until the end of index.php
1543          *      EDIT_AUTOSUMMARY
1544          *          Fill in blank summaries with generated text where possible
1545          *
1546          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1547          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1548          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1549          * edit-already-exists error will be returned. These two conditions are also possible with
1550          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1551          *
1552          * @param $baseRevId the revision ID this edit was based off, if any
1553          * @param $user Optional user object, $wgUser will be used if not passed
1554          *
1555          * @return Status object. Possible errors:
1556          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1557          *     edit-gone-missing:       In update mode, but the article didn't exist
1558          *     edit-conflict:           In update mode, the article changed unexpectedly
1559          *     edit-no-change:          Warning that the text was the same as before
1560          *     edit-already-exists:     In creation mode, but the article already exists
1561          *
1562          *  Extensions may define additional errors.
1563          *
1564          *  $return->value will contain an associative array with members as follows:
1565          *     new:                     Boolean indicating if the function attempted to create a new article
1566          *     revision:                The revision object for the inserted revision, or null
1567          *
1568          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1569          */
1570         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1571                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1572
1573                 # Low-level sanity check
1574                 if( $this->mTitle->getText() == '' ) {
1575                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1576                 }
1577
1578                 wfProfileIn( __METHOD__ );
1579
1580                 $user = is_null($user) ? $wgUser : $user;
1581                 $status = Status::newGood( array() );
1582
1583                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1584                 $this->loadPageData();
1585
1586                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1587                         $aid = $this->mTitle->getArticleID();
1588                         if( $aid ) {
1589                                 $flags |= EDIT_UPDATE;
1590                         } else {
1591                                 $flags |= EDIT_NEW;
1592                         }
1593                 }
1594
1595                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1596                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1597                 {
1598                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1599                         wfProfileOut( __METHOD__ );
1600                         if( $status->isOK() ) {
1601                                 $status->fatal( 'edit-hook-aborted');
1602                         }
1603                         return $status;
1604                 }
1605
1606                 # Silently ignore EDIT_MINOR if not allowed
1607                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1608                 $bot = $flags & EDIT_FORCE_BOT;
1609
1610                 $oldtext = $this->getRawText(); // current revision
1611                 $oldsize = strlen( $oldtext );
1612
1613                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1614                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1615                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1616                 }
1617
1618                 $editInfo = $this->prepareTextForEdit( $text );
1619                 $text = $editInfo->pst;
1620                 $newsize = strlen( $text );
1621
1622                 $dbw = wfGetDB( DB_MASTER );
1623                 $now = wfTimestampNow();
1624
1625                 if( $flags & EDIT_UPDATE ) {
1626                         # Update article, but only if changed.
1627                         $status->value['new'] = false;
1628                         # Make sure the revision is either completely inserted or not inserted at all
1629                         if( !$wgDBtransactions ) {
1630                                 $userAbort = ignore_user_abort( true );
1631                         }
1632
1633                         $revisionId = 0;
1634
1635                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1636
1637                         if( $changed ) {
1638                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1639                                   - (int)$this->isCountable( $oldtext );
1640                                 $this->mTotalAdjustment = 0;
1641
1642                                 if( !$this->mLatest ) {
1643                                         # Article gone missing
1644                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1645                                         $status->fatal( 'edit-gone-missing' );
1646                                         wfProfileOut( __METHOD__ );
1647                                         return $status;
1648                                 }
1649
1650                                 $revision = new Revision( array(
1651                                         'page'       => $this->getId(),
1652                                         'comment'    => $summary,
1653                                         'minor_edit' => $isminor,
1654                                         'text'       => $text,
1655                                         'parent_id'  => $this->mLatest,
1656                                         'user'       => $user->getId(),
1657                                         'user_text'  => $user->getName(),
1658                                         ) );
1659
1660                                 $dbw->begin();
1661                                 $revisionId = $revision->insertOn( $dbw );
1662
1663                                 # Update page
1664                                 #
1665                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1666                                 # during the course of this function. This makes sure that EditPage can detect
1667                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1668                                 # before this function is called. A previous function used a separate query, this
1669                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1670                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1671
1672                                 if( !$ok ) {
1673                                         /* Belated edit conflict! Run away!! */
1674                                         $status->fatal( 'edit-conflict' );
1675                                         # Delete the invalid revision if the DB is not transactional
1676                                         if( !$wgDBtransactions ) {
1677                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1678                                         }
1679                                         $revisionId = 0;
1680                                         $dbw->rollback();
1681                                 } else {
1682                                         global $wgUseRCPatrol;
1683                                         # Update recentchanges
1684                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1685                                                 # Mark as patrolled if the user can do so
1686                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1687                                                 # Add RC row to the DB
1688                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1689                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1690                                                         $revisionId, $patrolled
1691                                                 );
1692                                                 # Log auto-patrolled edits
1693                                                 if( $patrolled ) {
1694                                                         PatrolLog::record( $rc, true );
1695                                                 }
1696                                         }
1697                                         # Notify extensions of a new edit
1698                                         wfRunHooks( 'NewRevisionFromEditComplete', array(&$this, $revision, $baseRevId, $user) );
1699                                         $user->incEditCount();
1700                                         $dbw->commit();
1701                                 }
1702                         } else {
1703                                 $status->warning( 'edit-no-change' );
1704                                 $revision = null;
1705                                 // Keep the same revision ID, but do some updates on it
1706                                 $revisionId = $this->getRevIdFetched();
1707                                 // Update page_touched, this is usually implicit in the page update
1708                                 // Other cache updates are done in onArticleEdit()
1709                                 $this->mTitle->invalidateCache();
1710                         }
1711
1712                         if( !$wgDBtransactions ) {
1713                                 ignore_user_abort( $userAbort );
1714                         }
1715                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1716                         if( !$status->isOK() ) {
1717                                 wfProfileOut( __METHOD__ );
1718                                 return $status;
1719                         }
1720
1721                         # Invalidate cache of this article and all pages using this article
1722                         # as a template. Partly deferred.
1723                         Article::onArticleEdit( $this->mTitle );
1724                         # Update links tables, site stats, etc.
1725                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1726                 } else {
1727                         # Create new article
1728                         $status->value['new'] = true;
1729
1730                         # Set statistics members
1731                         # We work out if it's countable after PST to avoid counter drift
1732                         # when articles are created with {{subst:}}
1733                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1734                         $this->mTotalAdjustment = 1;
1735
1736                         $dbw->begin();
1737
1738                         # Add the page record; stake our claim on this title!
1739                         # This will return false if the article already exists
1740                         $newid = $this->insertOn( $dbw );
1741
1742                         if( $newid === false ) {
1743                                 $dbw->rollback();
1744                                 $status->fatal( 'edit-already-exists' );
1745                                 wfProfileOut( __METHOD__ );
1746                                 return $status;
1747                         }
1748
1749                         # Save the revision text...
1750                         $revision = new Revision( array(
1751                                 'page'       => $newid,
1752                                 'comment'    => $summary,
1753                                 'minor_edit' => $isminor,
1754                                 'text'       => $text,
1755                                 'user'       => $user->getId(),
1756                                 'user_text'  => $user->getName(),
1757                                 ) );
1758                         $revisionId = $revision->insertOn( $dbw );
1759
1760                         $this->mTitle->resetArticleID( $newid );
1761
1762                         # Update the page record with revision data
1763                         $this->updateRevisionOn( $dbw, $revision, 0 );
1764
1765                         # Update recentchanges
1766                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1767                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1768                                 # Mark as patrolled if the user can do so
1769                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1770                                 # Add RC row to the DB
1771                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1772                                         '', strlen($text), $revisionId, $patrolled );
1773                                 # Log auto-patrolled edits
1774                                 if( $patrolled ) {
1775                                         PatrolLog::record( $rc, true );
1776                                 }
1777                         }
1778                         # Notify extensions of a new page edit
1779                         wfRunHooks( 'NewRevisionFromEditComplete', array(&$this, $revision, false, $user) );
1780                         $user->incEditCount();
1781                         $dbw->commit();
1782
1783                         # Update links, etc.
1784                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1785
1786                         # Clear caches
1787                         Article::onArticleCreate( $this->mTitle );
1788
1789                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1790                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1791                 }
1792
1793                 # Do updates right now unless deferral was requested
1794                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1795                         wfDoUpdates();
1796                 }
1797
1798                 // Return the new revision (or null) to the caller
1799                 $status->value['revision'] = $revision;
1800
1801                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1802                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1803
1804                 wfProfileOut( __METHOD__ );
1805                 return $status;
1806         }
1807
1808         /**
1809          * @deprecated wrapper for doRedirect
1810          */
1811         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1812                 wfDeprecated( __METHOD__ );
1813                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1814         }
1815
1816         /**
1817          * Output a redirect back to the article.
1818          * This is typically used after an edit.
1819          *
1820          * @param $noRedir Boolean: add redirect=no
1821          * @param $sectionAnchor String: section to redirect to, including "#"
1822          * @param $extraQuery String: extra query params
1823          */
1824         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1825                 global $wgOut;
1826                 if( $noRedir ) {
1827                         $query = 'redirect=no';
1828                         if( $extraQuery )
1829                                 $query .= "&$query";
1830                 } else {
1831                         $query = $extraQuery;
1832                 }
1833                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1834         }
1835
1836         /**
1837          * Mark this particular edit/page as patrolled
1838          */
1839         public function markpatrolled() {
1840                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1841                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1842
1843                 # If we haven't been given an rc_id value, we can't do anything
1844                 $rcid = (int) $wgRequest->getVal('rcid');
1845                 $rc = RecentChange::newFromId($rcid);
1846                 if( is_null($rc) ) {
1847                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1848                         return;
1849                 }
1850
1851                 #It would be nice to see where the user had actually come from, but for now just guess
1852                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1853                 $return = SpecialPage::getTitleFor( $returnto );
1854
1855                 $dbw = wfGetDB( DB_MASTER );
1856                 $errors = $rc->doMarkPatrolled();
1857
1858                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1859                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1860                         return;
1861                 }
1862
1863                 if( in_array(array('hookaborted'), $errors) ) {
1864                         // The hook itself has handled any output
1865                         return;
1866                 }
1867
1868                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1869                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1870                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1871                         $wgOut->returnToMain( false, $return );
1872                         return;
1873                 }
1874
1875                 if( !empty($errors) ) {
1876                         $wgOut->showPermissionsErrorPage( $errors );
1877                         return;
1878                 }
1879
1880                 # Inform the user
1881                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1882                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1883                 $wgOut->returnToMain( false, $return );
1884         }
1885
1886         /**
1887          * User-interface handler for the "watch" action
1888          */
1889
1890         public function watch() {
1891                 global $wgUser, $wgOut;
1892                 if( $wgUser->isAnon() ) {
1893                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1894                         return;
1895                 }
1896                 if( wfReadOnly() ) {
1897                         $wgOut->readOnlyPage();
1898                         return;
1899                 }
1900                 if( $this->doWatch() ) {
1901                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1902                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1903                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1904                 }
1905                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1906         }
1907
1908         /**
1909          * Add this page to $wgUser's watchlist
1910          * @return bool true on successful watch operation
1911          */
1912         public function doWatch() {
1913                 global $wgUser;
1914                 if( $wgUser->isAnon() ) {
1915                         return false;
1916                 }
1917                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1918                         $wgUser->addWatch( $this->mTitle );
1919                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1920                 }
1921                 return false;
1922         }
1923
1924         /**
1925          * User interface handler for the "unwatch" action.
1926          */
1927         public function unwatch() {
1928                 global $wgUser, $wgOut;
1929                 if( $wgUser->isAnon() ) {
1930                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1931                         return;
1932                 }
1933                 if( wfReadOnly() ) {
1934                         $wgOut->readOnlyPage();
1935                         return;
1936                 }
1937                 if( $this->doUnwatch() ) {
1938                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1939                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1940                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1941                 }
1942                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1943         }
1944
1945         /**
1946          * Stop watching a page
1947          * @return bool true on successful unwatch
1948          */
1949         public function doUnwatch() {
1950                 global $wgUser;
1951                 if( $wgUser->isAnon() ) {
1952                         return false;
1953                 }
1954                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1955                         $wgUser->removeWatch( $this->mTitle );
1956                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1957                 }
1958                 return false;
1959         }
1960
1961         /**
1962          * action=protect handler
1963          */
1964         public function protect() {
1965                 $form = new ProtectionForm( $this );
1966                 $form->execute();
1967         }
1968
1969         /**
1970          * action=unprotect handler (alias)
1971          */
1972         public function unprotect() {
1973                 $this->protect();
1974         }
1975
1976         /**
1977          * Update the article's restriction field, and leave a log entry.
1978          *
1979          * @param $limit Array: set of restriction keys
1980          * @param $reason String
1981          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1982          * @param $expiry Array: per restriction type expiration
1983          * @return bool true on success
1984          */
1985         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1986                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1987
1988                 $id = $this->mTitle->getArticleID();
1989                 if ( $id <= 0 ) {
1990                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
1991                         return false;
1992                 }
1993
1994                 if ( wfReadOnly() ) {
1995                         wfDebug( "updateRestrictions failed: read-only\n" );
1996                         return false;
1997                 }
1998
1999                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2000                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2001                         return false;
2002                 }
2003
2004                 if( !$cascade ) {
2005                         $cascade = false;
2006                 }
2007
2008                 // Take this opportunity to purge out expired restrictions
2009                 Title::purgeExpiredRestrictions();
2010
2011                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2012                 # we expect a single selection, but the schema allows otherwise.
2013                 $current = array();
2014                 $updated = Article::flattenRestrictions( $limit );
2015                 $changed = false;
2016                 foreach( $wgRestrictionTypes as $action ) {
2017                         if( isset( $expiry[$action] ) ) {
2018                                 # Get current restrictions on $action
2019                                 $aLimits = $this->mTitle->getRestrictions( $action );
2020                                 $current[$action] = implode( '', $aLimits );
2021                                 # Are any actual restrictions being dealt with here?
2022                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
2023                                 # If something changed, we need to log it. Checking $aRChanged
2024                                 # assures that "unprotecting" a page that is not protected does
2025                                 # not log just because the expiry was "changed".
2026                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2027                                         $changed = true;
2028                                 }
2029                         }
2030                 }
2031
2032                 $current = Article::flattenRestrictions( $current );
2033
2034                 $changed = ($changed || $current != $updated );
2035                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
2036                 $protect = ( $updated != '' );
2037
2038                 # If nothing's changed, do nothing
2039                 if( $changed ) {
2040                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2041
2042                                 $dbw = wfGetDB( DB_MASTER );
2043
2044                                 # Prepare a null revision to be added to the history
2045                                 $modified = $current != '' && $protect;
2046                                 if( $protect ) {
2047                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2048                                 } else {
2049                                         $comment_type = 'unprotectedarticle';
2050                                 }
2051                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2052
2053                                 # Only restrictions with the 'protect' right can cascade...
2054                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2055                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2056                                 # The schema allows multiple restrictions
2057                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2058                                         $cascade = false;
2059                                 $cascade_description = '';
2060                                 if( $cascade ) {
2061                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2062                                 }
2063
2064                                 if( $reason )
2065                                         $comment .= ": $reason";
2066
2067                                 $editComment = $comment;
2068                                 $encodedExpiry = array();
2069                                 $protect_description = '';
2070                                 foreach( $limit as $action => $restrictions  ) {
2071                                         if ( !isset($expiry[$action]) )
2072                                                 $expiry[$action] = 'infinite';
2073
2074                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2075                                         if( $restrictions != '' ) {
2076                                                 $protect_description .= "[$action=$restrictions] (";
2077                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2078                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2079                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2080                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2081                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2082                                                 } else {
2083                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2084                                                 }
2085                                                 $protect_description .= ') ';
2086                                         }
2087                                 }
2088                                 $protect_description = trim($protect_description);
2089
2090                                 if( $protect_description && $protect )
2091                                         $editComment .= " ($protect_description)";
2092                                 if( $cascade )
2093                                         $editComment .= "$cascade_description";
2094                                 # Update restrictions table
2095                                 foreach( $limit as $action => $restrictions ) {
2096                                         if($restrictions != '' ) {
2097                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2098                                                         array( 'pr_page' => $id,
2099                                                                 'pr_type' => $action,
2100                                                                 'pr_level' => $restrictions,
2101                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2102                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2103                                         } else {
2104                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2105                                                         'pr_type' => $action ), __METHOD__ );
2106                                         }
2107                                 }
2108
2109                                 # Insert a null revision
2110                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2111                                 $nullRevId = $nullRevision->insertOn( $dbw );
2112
2113                                 $latest = $this->getLatest();
2114                                 # Update page record
2115                                 $dbw->update( 'page',
2116                                         array( /* SET */
2117                                                 'page_touched' => $dbw->timestamp(),
2118                                                 'page_restrictions' => '',
2119                                                 'page_latest' => $nullRevId
2120                                         ), array( /* WHERE */
2121                                                 'page_id' => $id
2122                                         ), 'Article::protect'
2123                                 );
2124
2125                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2126                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2127
2128                                 # Update the protection log
2129                                 $log = new LogPage( 'protect' );
2130                                 if( $protect ) {
2131                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2132                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2133                                 } else {
2134                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2135                                 }
2136
2137                         } # End hook
2138                 } # End "changed" check
2139
2140                 return true;
2141         }
2142
2143         /**
2144          * Take an array of page restrictions and flatten it to a string
2145          * suitable for insertion into the page_restrictions field.
2146          * @param $limit Array
2147          * @return String
2148          */
2149         protected static function flattenRestrictions( $limit ) {
2150                 if( !is_array( $limit ) ) {
2151                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2152                 }
2153                 $bits = array();
2154                 ksort( $limit );
2155                 foreach( $limit as $action => $restrictions ) {
2156                         if( $restrictions != '' ) {
2157                                 $bits[] = "$action=$restrictions";
2158                         }
2159                 }
2160                 return implode( ':', $bits );
2161         }
2162
2163         /**
2164          * Auto-generates a deletion reason
2165          * @param &$hasHistory Boolean: whether the page has a history
2166          */
2167         public function generateReason( &$hasHistory ) {
2168                 global $wgContLang;
2169                 $dbw = wfGetDB( DB_MASTER );
2170                 // Get the last revision
2171                 $rev = Revision::newFromTitle( $this->mTitle );
2172                 if( is_null( $rev ) )
2173                         return false;
2174
2175                 // Get the article's contents
2176                 $contents = $rev->getText();
2177                 $blank = false;
2178                 // If the page is blank, use the text from the previous revision,
2179                 // which can only be blank if there's a move/import/protect dummy revision involved
2180                 if( $contents == '' ) {
2181                         $prev = $rev->getPrevious();
2182                         if( $prev )     {
2183                                 $contents = $prev->getText();
2184                                 $blank = true;
2185                         }
2186                 }
2187
2188                 // Find out if there was only one contributor
2189                 // Only scan the last 20 revisions
2190                 $res = $dbw->select( 'revision', 'rev_user_text',
2191                         array( 'rev_page' => $this->getID(), 'rev_deleted & '.Revision::DELETED_USER.'=0' ),
2192                         __METHOD__,
2193                         array( 'LIMIT' => 20 )
2194                 );
2195                 if( $res === false )
2196                         // This page has no revisions, which is very weird
2197                         return false;
2198
2199                 $hasHistory = ( $res->numRows() > 1 );
2200                 $row = $dbw->fetchObject( $res );
2201                 $onlyAuthor = $row->rev_user_text;
2202                 // Try to find a second contributor
2203                 foreach( $res as $row ) {
2204                         if( $row->rev_user_text != $onlyAuthor ) {
2205                                 $onlyAuthor = false;
2206                                 break;
2207                         }
2208                 }
2209                 $dbw->freeResult( $res );
2210
2211                 // Generate the summary with a '$1' placeholder
2212                 if( $blank ) {
2213                         // The current revision is blank and the one before is also
2214                         // blank. It's just not our lucky day
2215                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2216                 } else {
2217                         if( $onlyAuthor )
2218                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2219                         else
2220                                 $reason = wfMsgForContent( 'excontent', '$1' );
2221                 }
2222
2223                 if( $reason == '-' ) {
2224                         // Allow these UI messages to be blanked out cleanly
2225                         return '';
2226                 }
2227
2228                 // Replace newlines with spaces to prevent uglyness
2229                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2230                 // Calculate the maximum amount of chars to get
2231                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2232                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2233                 $contents = $wgContLang->truncate( $contents, $maxLength );
2234                 // Remove possible unfinished links
2235                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2236                 // Now replace the '$1' placeholder
2237                 $reason = str_replace( '$1', $contents, $reason );
2238                 return $reason;
2239         }
2240
2241
2242         /*
2243          * UI entry point for page deletion
2244          */
2245         public function delete() {
2246                 global $wgUser, $wgOut, $wgRequest;
2247
2248                 $confirm = $wgRequest->wasPosted() &&
2249                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2250
2251                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2252                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2253
2254                 $reason = $this->DeleteReasonList;
2255
2256                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2257                         // Entry from drop down menu + additional comment
2258                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2259                 } elseif( $reason == 'other' ) {
2260                         $reason = $this->DeleteReason;
2261                 }
2262                 # Flag to hide all contents of the archived revisions
2263                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2264
2265                 # This code desperately needs to be totally rewritten
2266
2267                 # Read-only check...
2268                 if( wfReadOnly() ) {
2269                         $wgOut->readOnlyPage();
2270                         return;
2271                 }
2272
2273                 # Check permissions
2274                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2275
2276                 if( count( $permission_errors ) > 0 ) {
2277                         $wgOut->showPermissionsErrorPage( $permission_errors );
2278                         return;
2279                 }
2280
2281                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2282
2283                 # Better double-check that it hasn't been deleted yet!
2284                 $dbw = wfGetDB( DB_MASTER );
2285                 $conds = $this->mTitle->pageCond();
2286                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2287                 if( $latest === false ) {
2288                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2289                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2290                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2291                         return;
2292                 }
2293
2294                 # Hack for big sites
2295                 $bigHistory = $this->isBigDeletion();
2296                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2297                         global $wgLang, $wgDeleteRevisionsLimit;
2298                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2299                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2300                         return;
2301                 }
2302
2303                 if( $confirm ) {
2304                         $this->doDelete( $reason, $suppress );
2305                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2306                                 $this->doWatch();
2307                         } elseif( $this->mTitle->userIsWatching() ) {
2308                                 $this->doUnwatch();
2309                         }
2310                         return;
2311                 }
2312
2313                 // Generate deletion reason
2314                 $hasHistory = false;
2315                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2316
2317                 // If the page has a history, insert a warning
2318                 if( $hasHistory && !$confirm ) {
2319                         $skin = $wgUser->getSkin();
2320                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2321                         if( $bigHistory ) {
2322                                 global $wgLang, $wgDeleteRevisionsLimit;
2323                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2324                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2325                         }
2326                 }
2327
2328                 return $this->confirmDelete( $reason );
2329         }
2330
2331         /**
2332          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2333          */
2334         public function isBigDeletion() {
2335                 global $wgDeleteRevisionsLimit;
2336                 if( $wgDeleteRevisionsLimit ) {
2337                         $revCount = $this->estimateRevisionCount();
2338                         return $revCount > $wgDeleteRevisionsLimit;
2339                 }
2340                 return false;
2341         }
2342
2343         /**
2344          * @return int approximate revision count
2345          */
2346         public function estimateRevisionCount() {
2347                 $dbr = wfGetDB( DB_SLAVE );
2348                 // For an exact count...
2349                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2350                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2351                 return $dbr->estimateRowCount( 'revision', '*',
2352                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2353         }
2354
2355         /**
2356          * Get the last N authors
2357          * @param $num Integer: number of revisions to get
2358          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2359          * @return array Array of authors, duplicates not removed
2360          */
2361         public function getLastNAuthors( $num, $revLatest = 0 ) {
2362                 wfProfileIn( __METHOD__ );
2363                 // First try the slave
2364                 // If that doesn't have the latest revision, try the master
2365                 $continue = 2;
2366                 $db = wfGetDB( DB_SLAVE );
2367                 do {
2368                         $res = $db->select( array( 'page', 'revision' ),
2369                                 array( 'rev_id', 'rev_user_text' ),
2370                                 array(
2371                                         'page_namespace' => $this->mTitle->getNamespace(),
2372                                         'page_title' => $this->mTitle->getDBkey(),
2373                                         'rev_page = page_id'
2374                                 ), __METHOD__, $this->getSelectOptions( array(
2375                                         'ORDER BY' => 'rev_timestamp DESC',
2376                                         'LIMIT' => $num
2377                                 ) )
2378                         );
2379                         if( !$res ) {
2380                                 wfProfileOut( __METHOD__ );
2381                                 return array();
2382                         }
2383                         $row = $db->fetchObject( $res );
2384                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2385                                 $db = wfGetDB( DB_MASTER );
2386                                 $continue--;
2387                         } else {
2388                                 $continue = 0;
2389                         }
2390                 } while ( $continue );
2391
2392                 $authors = array( $row->rev_user_text );
2393                 while ( $row = $db->fetchObject( $res ) ) {
2394                         $authors[] = $row->rev_user_text;
2395                 }
2396                 wfProfileOut( __METHOD__ );
2397                 return $authors;
2398         }
2399
2400         /**
2401          * Output deletion confirmation dialog
2402          * @param $reason String: prefilled reason
2403          */
2404         public function confirmDelete( $reason ) {
2405                 global $wgOut, $wgUser;
2406
2407                 wfDebug( "Article::confirmDelete\n" );
2408
2409                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2410                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2411                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2412
2413                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2414                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2415                                         <td></td>
2416                                         <td class='mw-input'><strong>" .
2417                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2418                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2419                                         "</strong></td>
2420                                 </tr>";
2421                 } else {
2422                         $suppress = '';
2423                 }
2424                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2425
2426                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2427                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2428                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2429                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2430                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2431                         "<tr id=\"wpDeleteReasonListRow\">
2432                                 <td class='mw-label'>" .
2433                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2434                                 "</td>
2435                                 <td class='mw-input'>" .
2436                                         Xml::listDropDown( 'wpDeleteReasonList',
2437                                                 wfMsgForContent( 'deletereason-dropdown' ),
2438                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2439                                 "</td>
2440                         </tr>
2441                         <tr id=\"wpDeleteReasonRow\">
2442                                 <td class='mw-label'>" .
2443                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2444                                 "</td>
2445                                 <td class='mw-input'>" .
2446                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2447                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2448                                 "</td>
2449                         </tr>
2450                         <tr>
2451                                 <td></td>
2452                                 <td class='mw-input'>" .
2453                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2454                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2455                                 "</td>
2456                         </tr>
2457                         $suppress
2458                         <tr>
2459                                 <td></td>
2460                                 <td class='mw-submit'>" .
2461                                         Xml::submitButton( wfMsg( 'deletepage' ),
2462                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2463                                 "</td>
2464                         </tr>" .
2465                         Xml::closeElement( 'table' ) .
2466                         Xml::closeElement( 'fieldset' ) .
2467                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2468                         Xml::closeElement( 'form' );
2469
2470                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2471                                 $skin = $wgUser->getSkin();
2472                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2473                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2474                         }
2475
2476                 $wgOut->addHTML( $form );
2477                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2478         }
2479
2480         /**
2481          * Perform a deletion and output success or failure messages
2482          */
2483         public function doDelete( $reason, $suppress = false ) {
2484                 global $wgOut, $wgUser;
2485                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2486
2487                 $error = '';
2488                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2489                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2490                                 $deleted = $this->mTitle->getPrefixedText();
2491
2492                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2493                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2494
2495                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2496
2497                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2498                                 $wgOut->returnToMain( false );
2499                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2500                         } else {
2501                                 if( $error == '' ) {
2502                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2503                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2504                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2505                                 } else {
2506                                         $wgOut->showFatalError( $error );
2507                                 }
2508                         }
2509                 }
2510         }
2511
2512         /**
2513          * Back-end article deletion
2514          * Deletes the article with database consistency, writes logs, purges caches
2515          * Returns success
2516          */
2517         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2518                 global $wgUseSquid, $wgDeferredUpdateList;
2519                 global $wgUseTrackbacks;
2520
2521                 wfDebug( __METHOD__."\n" );
2522
2523                 $dbw = wfGetDB( DB_MASTER );
2524                 $ns = $this->mTitle->getNamespace();
2525                 $t = $this->mTitle->getDBkey();
2526                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2527
2528                 if( $t == '' || $id == 0 ) {
2529                         return false;
2530                 }
2531
2532                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2533                 array_push( $wgDeferredUpdateList, $u );
2534
2535                 // Bitfields to further suppress the content
2536                 if( $suppress ) {
2537                         $bitfield = 0;
2538                         // This should be 15...
2539                         $bitfield |= Revision::DELETED_TEXT;
2540                         $bitfield |= Revision::DELETED_COMMENT;
2541                         $bitfield |= Revision::DELETED_USER;
2542                         $bitfield |= Revision::DELETED_RESTRICTED;
2543                 } else {
2544                         $bitfield = 'rev_deleted';
2545                 }
2546
2547                 $dbw->begin();
2548                 // For now, shunt the revision data into the archive table.
2549                 // Text is *not* removed from the text table; bulk storage
2550                 // is left intact to avoid breaking block-compression or
2551                 // immutable storage schemes.
2552                 //
2553                 // For backwards compatibility, note that some older archive
2554                 // table entries will have ar_text and ar_flags fields still.
2555                 //
2556                 // In the future, we may keep revisions and mark them with
2557                 // the rev_deleted field, which is reserved for this purpose.
2558                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2559                         array(
2560                                 'ar_namespace'  => 'page_namespace',
2561                                 'ar_title'      => 'page_title',
2562                                 'ar_comment'    => 'rev_comment',
2563                                 'ar_user'       => 'rev_user',
2564                                 'ar_user_text'  => 'rev_user_text',
2565                                 'ar_timestamp'  => 'rev_timestamp',
2566                                 'ar_minor_edit' => 'rev_minor_edit',
2567                                 'ar_rev_id'     => 'rev_id',
2568                                 'ar_text_id'    => 'rev_text_id',
2569                                 'ar_text'       => '\'\'', // Be explicit to appease
2570                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2571                                 'ar_len'        => 'rev_len',
2572                                 'ar_page_id'    => 'page_id',
2573                                 'ar_deleted'    => $bitfield
2574                         ), array(
2575                                 'page_id' => $id,
2576                                 'page_id = rev_page'
2577                         ), __METHOD__
2578                 );
2579
2580                 # Delete restrictions for it
2581                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2582
2583                 # Now that it's safely backed up, delete it
2584                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2585                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2586                 if( !$ok ) {
2587                         $dbw->rollback();
2588                         return false;
2589                 }
2590
2591                 # Fix category table counts
2592                 $cats = array();
2593                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2594                 foreach( $res as $row ) {
2595                         $cats []= $row->cl_to;
2596                 }
2597                 $this->updateCategoryCounts( array(), $cats );
2598
2599                 # If using cascading deletes, we can skip some explicit deletes
2600                 if( !$dbw->cascadingDeletes() ) {
2601                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2602
2603                         if($wgUseTrackbacks)
2604                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2605
2606                         # Delete outgoing links
2607                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2608                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2609                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2610                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2611                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2612                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2613                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2614                 }
2615
2616                 # If using cleanup triggers, we can skip some manual deletes
2617                 if( !$dbw->cleanupTriggers() ) {
2618                         # Clean up recentchanges entries...
2619                         $dbw->delete( 'recentchanges',
2620                                 array( 'rc_type != '.RC_LOG,
2621                                         'rc_namespace' => $this->mTitle->getNamespace(),
2622                                         'rc_title' => $this->mTitle->getDBKey() ),
2623                                 __METHOD__ );
2624                         $dbw->delete( 'recentchanges',
2625                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2626                                 __METHOD__ );
2627                 }
2628
2629                 # Clear caches
2630                 Article::onArticleDelete( $this->mTitle );
2631
2632                 # Clear the cached article id so the interface doesn't act like we exist
2633                 $this->mTitle->resetArticleID( 0 );
2634
2635                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2636                 $logtype = $suppress ? 'suppress' : 'delete';
2637                 $log = new LogPage( $logtype );
2638
2639                 # Make sure logging got through
2640                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2641
2642                 $dbw->commit();
2643
2644                 return true;
2645         }
2646
2647         /**
2648          * Roll back the most recent consecutive set of edits to a page
2649          * from the same user; fails if there are no eligible edits to
2650          * roll back to, e.g. user is the sole contributor. This function
2651          * performs permissions checks on $wgUser, then calls commitRollback()
2652          * to do the dirty work
2653          *
2654          * @param $fromP String: Name of the user whose edits to rollback.
2655          * @param $summary String: Custom summary. Set to default summary if empty.
2656          * @param $token String: Rollback token.
2657          * @param $bot Boolean: If true, mark all reverted edits as bot.
2658          *
2659          * @param $resultDetails Array: contains result-specific array of additional values
2660          *    'alreadyrolled' : 'current' (rev)
2661          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2662          *
2663          * @return array of errors, each error formatted as
2664          *   array(messagekey, param1, param2, ...).
2665          * On success, the array is empty.  This array can also be passed to
2666          * OutputPage::showPermissionsErrorPage().
2667          */
2668         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2669                 global $wgUser;
2670                 $resultDetails = null;
2671
2672                 # Check permissions
2673                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2674                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2675                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2676
2677                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2678                         $errors[] = array( 'sessionfailure' );
2679
2680                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2681                         $errors[] = array( 'actionthrottledtext' );
2682                 }
2683                 # If there were errors, bail out now
2684                 if( !empty( $errors ) )
2685                         return $errors;
2686
2687                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2688         }
2689
2690         /**
2691          * Backend implementation of doRollback(), please refer there for parameter
2692          * and return value documentation
2693          *
2694          * NOTE: This function does NOT check ANY permissions, it just commits the
2695          * rollback to the DB Therefore, you should only call this function direct-
2696          * ly if you want to use custom permissions checks. If you don't, use
2697          * doRollback() instead.
2698          */
2699         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2700                 global $wgUseRCPatrol, $wgUser, $wgLang;
2701                 $dbw = wfGetDB( DB_MASTER );
2702
2703                 if( wfReadOnly() ) {
2704                         return array( array( 'readonlytext' ) );
2705                 }
2706
2707                 # Get the last editor
2708                 $current = Revision::newFromTitle( $this->mTitle );
2709                 if( is_null( $current ) ) {
2710                         # Something wrong... no page?
2711                         return array(array('notanarticle'));
2712                 }
2713
2714                 $from = str_replace( '_', ' ', $fromP );
2715                 if( $from != $current->getUserText() ) {
2716                         $resultDetails = array( 'current' => $current );
2717                         return array(array('alreadyrolled',
2718                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2719                                 htmlspecialchars($fromP),
2720                                 htmlspecialchars($current->getUserText())
2721                         ));
2722                 }
2723
2724                 # Get the last edit not by this guy
2725                 $user = intval( $current->getUser() );
2726                 $user_text = $dbw->addQuotes( $current->getUserText() );
2727                 $s = $dbw->selectRow( 'revision',
2728                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2729                         array(  'rev_page' => $current->getPage(),
2730                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2731                         ), __METHOD__,
2732                         array(  'USE INDEX' => 'page_timestamp',
2733                                 'ORDER BY'  => 'rev_timestamp DESC' )
2734                         );
2735                 if( $s === false ) {
2736                         # No one else ever edited this page
2737                         return array(array('cantrollback'));
2738                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2739                         # Only admins can see this text
2740                         return array(array('notvisiblerev'));
2741                 }
2742
2743                 $set = array();
2744                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2745                         # Mark all reverted edits as bot
2746                         $set['rc_bot'] = 1;
2747                 }
2748                 if( $wgUseRCPatrol ) {
2749                         # Mark all reverted edits as patrolled
2750                         $set['rc_patrolled'] = 1;
2751                 }
2752
2753                 if( $set ) {
2754                         $dbw->update( 'recentchanges', $set,
2755                                         array( /* WHERE */
2756                                                 'rc_cur_id' => $current->getPage(),
2757                                                 'rc_user_text' => $current->getUserText(),
2758                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2759                                         ), __METHOD__
2760                                 );
2761                 }
2762
2763                 # Generate the edit summary if necessary
2764                 $target = Revision::newFromId( $s->rev_id );
2765                 if( empty( $summary ) ){
2766                         $summary = wfMsgForContent( 'revertpage' );
2767                 }
2768
2769                 # Allow the custom summary to use the same args as the default message
2770                 $args = array(
2771                         $target->getUserText(), $from, $s->rev_id,
2772                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2773                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2774                 );
2775                 $summary = wfMsgReplaceArgs( $summary, $args );
2776
2777                 # Save
2778                 $flags = EDIT_UPDATE;
2779
2780                 if( $wgUser->isAllowed('minoredit') )
2781                         $flags |= EDIT_MINOR;
2782
2783                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2784                         $flags |= EDIT_FORCE_BOT;
2785                 # Actually store the edit
2786                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2787                 if( !empty( $status->value['revision'] ) ) {
2788                         $revId = $status->value['revision']->getId();
2789                 } else {
2790                         $revId = false;
2791                 }
2792
2793                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2794
2795                 $resultDetails = array(
2796                         'summary' => $summary,
2797                         'current' => $current,
2798                         'target' => $target,
2799                         'newid' => $revId
2800                 );
2801                 return array();
2802         }
2803
2804         /**
2805          * User interface for rollback operations
2806          */
2807         public function rollback() {
2808                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2809                 $details = null;
2810
2811                 $result = $this->doRollback(
2812                         $wgRequest->getVal( 'from' ),
2813                         $wgRequest->getText( 'summary' ),
2814                         $wgRequest->getVal( 'token' ),
2815                         $wgRequest->getBool( 'bot' ),
2816                         $details
2817                 );
2818
2819                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2820                         $wgOut->rateLimited();
2821                         return;
2822                 }
2823                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2824                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2825                         $errArray = $result[0];
2826                         $errMsg = array_shift( $errArray );
2827                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2828                         if( isset( $details['current'] ) ){
2829                                 $current = $details['current'];
2830                                 if( $current->getComment() != '' ) {
2831                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2832                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2833                                 }
2834                         }
2835                         return;
2836                 }
2837                 # Display permissions errors before read-only message -- there's no
2838                 # point in misleading the user into thinking the inability to rollback
2839                 # is only temporary.
2840                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2841                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2842                         # move any 'readonlytext' error manually.
2843                         $out = array();
2844                         foreach( $result as $error ) {
2845                                 if( $error != array( 'readonlytext' ) ) {
2846                                         $out []= $error;
2847                                 }
2848                         }
2849                         $wgOut->showPermissionsErrorPage( $out );
2850                         return;
2851                 }
2852                 if( $result == array( array( 'readonlytext' ) ) ) {
2853                         $wgOut->readOnlyPage();
2854                         return;
2855                 }
2856
2857                 $current = $details['current'];
2858                 $target = $details['target'];
2859                 $newId = $details['newid'];
2860                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2861                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2862                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2863                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2864                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2865                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2866                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2867                 $wgOut->returnToMain( false, $this->mTitle );
2868
2869                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2870                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2871                         $de->showDiff( '', '' );
2872                 }
2873         }
2874
2875
2876         /**
2877          * Do standard deferred updates after page view
2878          */
2879         public function viewUpdates() {
2880                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2881                 # Don't update page view counters on views from bot users (bug 14044)
2882                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2883                         Article::incViewCount( $this->getID() );
2884                         $u = new SiteStatsUpdate( 1, 0, 0 );
2885                         array_push( $wgDeferredUpdateList, $u );
2886                 }
2887                 # Update newtalk / watchlist notification status
2888                 $wgUser->clearNotification( $this->mTitle );
2889         }
2890
2891         /**
2892          * Prepare text which is about to be saved.
2893          * Returns a stdclass with source, pst and output members
2894          */
2895         public function prepareTextForEdit( $text, $revid=null ) {
2896                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2897                         // Already prepared
2898                         return $this->mPreparedEdit;
2899                 }
2900                 global $wgParser;
2901                 $edit = (object)array();
2902                 $edit->revid = $revid;
2903                 $edit->newText = $text;
2904                 $edit->pst = $this->preSaveTransform( $text );
2905                 $options = new ParserOptions;
2906                 $options->setTidy( true );
2907                 $options->enableLimitReport();
2908                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2909                 $edit->oldText = $this->getContent();
2910                 $this->mPreparedEdit = $edit;
2911                 return $edit;
2912         }
2913
2914         /**
2915          * Do standard deferred updates after page edit.
2916          * Update links tables, site stats, search index and message cache.
2917          * Purges pages that include this page if the text was changed here.
2918          * Every 100th edit, prune the recent changes table.
2919          *
2920          * @private
2921          * @param $text New text of the article
2922          * @param $summary Edit summary
2923          * @param $minoredit Minor edit
2924          * @param $timestamp_of_pagechange Timestamp associated with the page change
2925          * @param $newid rev_id value of the new revision
2926          * @param $changed Whether or not the content actually changed
2927          */
2928         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2929                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2930
2931                 wfProfileIn( __METHOD__ );
2932
2933                 # Parse the text
2934                 # Be careful not to double-PST: $text is usually already PST-ed once
2935                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2936                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2937                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2938                 } else {
2939                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2940                         $editInfo = $this->mPreparedEdit;
2941                 }
2942
2943                 # Save it to the parser cache
2944                 if( $wgEnableParserCache ) {
2945                         $popts = new ParserOptions;
2946                         $popts->setTidy( true );
2947                         $popts->enableLimitReport();
2948                         $parserCache = ParserCache::singleton();
2949                         $parserCache->save( $editInfo->output, $this, $popts );
2950                 }
2951
2952                 # Update the links tables
2953                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2954                 $u->doUpdate();
2955
2956                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2957
2958                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2959                         if( 0 == mt_rand( 0, 99 ) ) {
2960                                 // Flush old entries from the `recentchanges` table; we do this on
2961                                 // random requests so as to avoid an increase in writes for no good reason
2962                                 global $wgRCMaxAge;
2963                                 $dbw = wfGetDB( DB_MASTER );
2964                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2965                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2966                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2967                                 $dbw->query( $sql );
2968                         }
2969                 }
2970
2971                 $id = $this->getID();
2972                 $title = $this->mTitle->getPrefixedDBkey();
2973                 $shortTitle = $this->mTitle->getDBkey();
2974
2975                 if( 0 == $id ) {
2976                         wfProfileOut( __METHOD__ );
2977                         return;
2978                 }
2979
2980                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2981                 array_push( $wgDeferredUpdateList, $u );
2982                 $u = new SearchUpdate( $id, $title, $text );
2983                 array_push( $wgDeferredUpdateList, $u );
2984
2985                 # If this is another user's talk page, update newtalk
2986                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2987                 # load of user talk pages and piss people off, nor if it's a minor edit
2988                 # by a properly-flagged bot.
2989                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2990                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2991                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2992                                 $other = User::newFromName( $shortTitle, false );
2993                                 if( !$other ) {
2994                                         wfDebug( __METHOD__.": invalid username\n" );
2995                                 } elseif( User::isIP( $shortTitle ) ) {
2996                                         // An anonymous user
2997                                         $other->setNewtalk( true );
2998                                 } elseif( $other->isLoggedIn() ) {
2999                                         $other->setNewtalk( true );
3000                                 } else {
3001                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
3002                                 }
3003                         }
3004                 }
3005
3006                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3007                         $wgMessageCache->replace( $shortTitle, $text );
3008                 }
3009
3010                 wfProfileOut( __METHOD__ );
3011         }
3012
3013         /**
3014          * Perform article updates on a special page creation.
3015          *
3016          * @param $rev Revision object
3017          *
3018          * @todo This is a shitty interface function. Kill it and replace the
3019          * other shitty functions like editUpdates and such so it's not needed
3020          * anymore.
3021          */
3022         public function createUpdates( $rev ) {
3023                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3024                 $this->mTotalAdjustment = 1;
3025                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3026                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3027         }
3028
3029         /**
3030          * Generate the navigation links when browsing through an article revisions
3031          * It shows the information as:
3032          *   Revision as of \<date\>; view current revision
3033          *   \<- Previous version | Next Version -\>
3034          *
3035          * @param $oldid String: revision ID of this article revision
3036          */
3037         public function setOldSubtitle( $oldid = 0 ) {
3038                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3039
3040                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3041                         return;
3042                 }
3043
3044                 $revision = Revision::newFromId( $oldid );
3045
3046                 $current = ( $oldid == $this->mLatest );
3047                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3048                 $sk = $wgUser->getSkin();
3049                 $lnk = $current
3050                         ? wfMsgHtml( 'currentrevisionlink' )
3051                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
3052                 $curdiff = $current
3053                         ? wfMsgHtml( 'diff' )
3054                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
3055                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3056                 $prevlink = $prev
3057                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
3058                         : wfMsgHtml( 'previousrevision' );
3059                 $prevdiff = $prev
3060                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
3061                         : wfMsgHtml( 'diff' );
3062                 $nextlink = $current
3063                         ? wfMsgHtml( 'nextrevision' )
3064                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
3065                 $nextdiff = $current
3066                         ? wfMsgHtml( 'diff' )
3067                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
3068
3069                 $cdel='';
3070                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3071                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3072                         if( $revision->isCurrent() ) {
3073                         // We don't handle top deleted edits too well
3074                                 $cdel = wfMsgHtml( 'rev-delundel' );
3075                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3076                         // If revision was hidden from sysops
3077                                 $cdel = wfMsgHtml( 'rev-delundel' );
3078                         } else {
3079                                 $cdel = $sk->makeKnownLinkObj( $revdel,
3080                                         wfMsgHtml('rev-delundel'),
3081                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
3082                                         '&oldid=' . urlencode( $oldid ) );
3083                                 // Bolden oversighted content
3084                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3085                                         $cdel = "<strong>$cdel</strong>";
3086                         }
3087                         $cdel = "(<small>$cdel</small>) ";
3088                 }
3089                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3090                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3091                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3092
3093                 $m = wfMsg( 'revision-info-current' );
3094                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3095                         ? 'revision-info-current'
3096                         : 'revision-info';
3097
3098                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ),
3099                         $td, $userlinks, $revision->getID() ) . "</div>\n" .
3100
3101                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3102                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3103                 $wgOut->setSubtitle( $r );
3104         }
3105
3106         /**
3107          * This function is called right before saving the wikitext,
3108          * so we can do things like signatures and links-in-context.
3109          *
3110          * @param $text String
3111          */
3112         public function preSaveTransform( $text ) {
3113                 global $wgParser, $wgUser;
3114                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3115         }
3116
3117         /* Caching functions */
3118
3119         /**
3120          * checkLastModified returns true if it has taken care of all
3121          * output to the client that is necessary for this request.
3122          * (that is, it has sent a cached version of the page)
3123          */
3124         protected function tryFileCache() {
3125                 static $called = false;
3126                 if( $called ) {
3127                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3128                         return false;
3129                 }
3130                 $called = true;
3131                 if( $this->isFileCacheable() ) {
3132                         $cache = new HTMLFileCache( $this->mTitle );
3133                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3134                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3135                                 $cache->loadFromFileCache();
3136                                 return true;
3137                         } else {
3138                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3139                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3140                         }
3141                 } else {
3142                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3143                 }
3144                 return false;
3145         }
3146
3147         /**
3148          * Check if the page can be cached
3149          * @return bool
3150          */
3151         public function isFileCacheable() {
3152                 $cacheable = false;
3153                 if( HTMLFileCache::useFileCache() ) {
3154                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3155                         // Extension may have reason to disable file caching on some pages.
3156                         if( $cacheable ) {
3157                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3158                         }
3159                 }
3160                 return $cacheable;
3161         }
3162
3163         /**
3164          * Loads page_touched and returns a value indicating if it should be used
3165          *
3166          */
3167         public function checkTouched() {
3168                 if( !$this->mDataLoaded ) {
3169                         $this->loadPageData();
3170                 }
3171                 return !$this->mIsRedirect;
3172         }
3173
3174         /**
3175          * Get the page_touched field
3176          */
3177         public function getTouched() {
3178                 # Ensure that page data has been loaded
3179                 if( !$this->mDataLoaded ) {
3180                         $this->loadPageData();
3181                 }
3182                 return $this->mTouched;
3183         }
3184
3185         /**
3186          * Get the page_latest field
3187          */
3188         public function getLatest() {
3189                 if( !$this->mDataLoaded ) {
3190                         $this->loadPageData();
3191                 }
3192                 return (int)$this->mLatest;
3193         }
3194
3195         /**
3196          * Edit an article without doing all that other stuff
3197          * The article must already exist; link tables etc
3198          * are not updated, caches are not flushed.
3199          *
3200          * @param $text String: text submitted
3201          * @param $comment String: comment submitted
3202          * @param $minor Boolean: whereas it's a minor modification
3203          */
3204         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3205                 wfProfileIn( __METHOD__ );
3206
3207                 $dbw = wfGetDB( DB_MASTER );
3208                 $revision = new Revision( array(
3209                         'page'       => $this->getId(),
3210                         'text'       => $text,
3211                         'comment'    => $comment,
3212                         'minor_edit' => $minor ? 1 : 0,
3213                         ) );
3214                 $revision->insertOn( $dbw );
3215                 $this->updateRevisionOn( $dbw, $revision );
3216
3217                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3218
3219                 wfProfileOut( __METHOD__ );
3220         }
3221
3222         /**
3223          * Used to increment the view counter
3224          *
3225          * @param $id Integer: article id
3226          */
3227         public static function incViewCount( $id ) {
3228                 $id = intval( $id );
3229                 global $wgHitcounterUpdateFreq, $wgDBtype;
3230
3231                 $dbw = wfGetDB( DB_MASTER );
3232                 $pageTable = $dbw->tableName( 'page' );
3233                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3234                 $acchitsTable = $dbw->tableName( 'acchits' );
3235
3236                 if( $wgHitcounterUpdateFreq <= 1 ) {
3237                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3238                         return;
3239                 }
3240
3241                 # Not important enough to warrant an error page in case of failure
3242                 $oldignore = $dbw->ignoreErrors( true );
3243
3244                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3245
3246                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3247                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3248                         # Most of the time (or on SQL errors), skip row count check
3249                         $dbw->ignoreErrors( $oldignore );
3250                         return;
3251                 }
3252
3253                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3254                 $row = $dbw->fetchObject( $res );
3255                 $rown = intval( $row->n );
3256                 if( $rown >= $wgHitcounterUpdateFreq ){
3257                         wfProfileIn( 'Article::incViewCount-collect' );
3258                         $old_user_abort = ignore_user_abort( true );
3259
3260                         if($wgDBtype == 'mysql')
3261                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3262                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3263                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3264                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3265                                 'GROUP BY hc_id');
3266                         $dbw->query("DELETE FROM $hitcounterTable");
3267                         if($wgDBtype == 'mysql') {
3268                                 $dbw->query('UNLOCK TABLES');
3269                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3270                                         'WHERE page_id = hc_id');
3271                         }
3272                         else {
3273                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3274                                         "FROM $acchitsTable WHERE page_id = hc_id");
3275                         }
3276                         $dbw->query("DROP TABLE $acchitsTable");
3277
3278                         ignore_user_abort( $old_user_abort );
3279                         wfProfileOut( 'Article::incViewCount-collect' );
3280                 }
3281                 $dbw->ignoreErrors( $oldignore );
3282         }
3283
3284         /**#@+
3285          * The onArticle*() functions are supposed to be a kind of hooks
3286          * which should be called whenever any of the specified actions
3287          * are done.
3288          *
3289          * This is a good place to put code to clear caches, for instance.
3290          *
3291          * This is called on page move and undelete, as well as edit
3292          *
3293          * @param $title a title object
3294          */
3295
3296         public static function onArticleCreate( $title ) {
3297                 # Update existence markers on article/talk tabs...
3298                 if( $title->isTalkPage() ) {
3299                         $other = $title->getSubjectPage();
3300                 } else {
3301                         $other = $title->getTalkPage();
3302                 }
3303                 $other->invalidateCache();
3304                 $other->purgeSquid();
3305
3306                 $title->touchLinks();
3307                 $title->purgeSquid();
3308                 $title->deleteTitleProtection();
3309         }
3310
3311         public static function onArticleDelete( $title ) {
3312                 global $wgMessageCache;
3313                 # Update existence markers on article/talk tabs...
3314                 if( $title->isTalkPage() ) {
3315                         $other = $title->getSubjectPage();
3316                 } else {
3317                         $other = $title->getTalkPage();
3318                 }
3319                 $other->invalidateCache();
3320                 $other->purgeSquid();
3321
3322                 $title->touchLinks();
3323                 $title->purgeSquid();
3324
3325                 # File cache
3326                 HTMLFileCache::clearFileCache( $title );
3327
3328                 # Messages
3329                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3330                         $wgMessageCache->replace( $title->getDBkey(), false );
3331                 }
3332                 # Images
3333                 if( $title->getNamespace() == NS_FILE ) {
3334                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3335                         $update->doUpdate();
3336                 }
3337                 # User talk pages
3338                 if( $title->getNamespace() == NS_USER_TALK ) {
3339                         $user = User::newFromName( $title->getText(), false );
3340                         $user->setNewtalk( false );
3341                 }
3342                 # Image redirects
3343                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3344         }
3345
3346         /**
3347          * Purge caches on page update etc
3348          */
3349         public static function onArticleEdit( $title, $flags = '' ) {
3350                 global $wgDeferredUpdateList;
3351
3352                 // Invalidate caches of articles which include this page
3353                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3354
3355                 // Invalidate the caches of all pages which redirect here
3356                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3357
3358                 # Purge squid for this page only
3359                 $title->purgeSquid();
3360
3361                 # Clear file cache for this page only
3362                 HTMLFileCache::clearFileCache( $title );
3363         }
3364
3365         /**#@-*/
3366
3367         /**
3368          * Overriden by ImagePage class, only present here to avoid a fatal error
3369          * Called for ?action=revert
3370          */
3371         public function revert() {
3372                 global $wgOut;
3373                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3374         }
3375
3376         /**
3377          * Info about this page
3378          * Called for ?action=info when $wgAllowPageInfo is on.
3379          */
3380         public function info() {
3381                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3382
3383                 if( !$wgAllowPageInfo ) {
3384                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3385                         return;
3386                 }
3387
3388                 $page = $this->mTitle->getSubjectPage();
3389
3390                 $wgOut->setPagetitle( $page->getPrefixedText() );
3391                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3392                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3393
3394                 if( !$this->mTitle->exists() ) {
3395                         $wgOut->addHTML( '<div class="noarticletext">' );
3396                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3397                                 // This doesn't quite make sense; the user is asking for
3398                                 // information about the _page_, not the message... -- RC
3399                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3400                         } else {
3401                                 $msg = $wgUser->isLoggedIn()
3402                                         ? 'noarticletext'
3403                                         : 'noarticletextanon';
3404                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3405                         }
3406                         $wgOut->addHTML( '</div>' );
3407                 } else {
3408                         $dbr = wfGetDB( DB_SLAVE );
3409                         $wl_clause = array(
3410                                 'wl_title'     => $page->getDBkey(),
3411                                 'wl_namespace' => $page->getNamespace() );
3412                         $numwatchers = $dbr->selectField(
3413                                 'watchlist',
3414                                 'COUNT(*)',
3415                                 $wl_clause,
3416                                 __METHOD__,
3417                                 $this->getSelectOptions() );
3418
3419                         $pageInfo = $this->pageCountInfo( $page );
3420                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3421
3422                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3423                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3424                         if( $talkInfo ) {
3425                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3426                         }
3427                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3428                         if( $talkInfo ) {
3429                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3430                         }
3431                         $wgOut->addHTML( '</ul>' );
3432                 }
3433         }
3434
3435         /**
3436          * Return the total number of edits and number of unique editors
3437          * on a given page. If page does not exist, returns false.
3438          *
3439          * @param $title Title object
3440          * @return array
3441          */
3442         public function pageCountInfo( $title ) {
3443                 $id = $title->getArticleId();
3444                 if( $id == 0 ) {
3445                         return false;
3446                 }
3447                 $dbr = wfGetDB( DB_SLAVE );
3448                 $rev_clause = array( 'rev_page' => $id );
3449                 $edits = $dbr->selectField(
3450                         'revision',
3451                         'COUNT(rev_page)',
3452                         $rev_clause,
3453                         __METHOD__,
3454                         $this->getSelectOptions()
3455                 );
3456                 $authors = $dbr->selectField(
3457                         'revision',
3458                         'COUNT(DISTINCT rev_user_text)',
3459                         $rev_clause,
3460                         __METHOD__,
3461                         $this->getSelectOptions()
3462                 );
3463                 return array( 'edits' => $edits, 'authors' => $authors );
3464         }
3465
3466         /**
3467          * Return a list of templates used by this article.
3468          * Uses the templatelinks table
3469          *
3470          * @return Array of Title objects
3471          */
3472         public function getUsedTemplates() {
3473                 $result = array();
3474                 $id = $this->mTitle->getArticleID();
3475                 if( $id == 0 ) {
3476                         return array();
3477                 }
3478                 $dbr = wfGetDB( DB_SLAVE );
3479                 $res = $dbr->select( array( 'templatelinks' ),
3480                         array( 'tl_namespace', 'tl_title' ),
3481                         array( 'tl_from' => $id ),
3482                         __METHOD__ );
3483                 if( $res !== false ) {
3484                         foreach( $res as $row ) {
3485                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3486                         }
3487                 }
3488                 $dbr->freeResult( $res );
3489                 return $result;
3490         }
3491
3492         /**
3493          * Returns a list of hidden categories this page is a member of.
3494          * Uses the page_props and categorylinks tables.
3495          *
3496          * @return Array of Title objects
3497          */
3498         public function getHiddenCategories() {
3499                 $result = array();
3500                 $id = $this->mTitle->getArticleID();
3501                 if( $id == 0 ) {
3502                         return array();
3503                 }
3504                 $dbr = wfGetDB( DB_SLAVE );
3505                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3506                         array( 'cl_to' ),
3507                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3508                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3509                         __METHOD__ );
3510                 if( $res !== false ) {
3511                         foreach( $res as $row ) {
3512                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3513                         }
3514                 }
3515                 $dbr->freeResult( $res );
3516                 return $result;
3517         }
3518
3519         /**
3520         * Return an applicable autosummary if one exists for the given edit.
3521         * @param $oldtext String: the previous text of the page.
3522         * @param $newtext String: The submitted text of the page.
3523         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3524         * @return string An appropriate autosummary, or an empty string.
3525         */
3526         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3527                 # Decide what kind of autosummary is needed.
3528
3529                 # Redirect autosummaries
3530                 $ot = Title::newFromRedirect( $oldtext );
3531                 $rt = Title::newFromRedirect( $newtext );
3532                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3533                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3534                 }
3535
3536                 # New page autosummaries
3537                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3538                         # If they're making a new article, give its text, truncated, in the summary.
3539                         global $wgContLang;
3540                         $truncatedtext = $wgContLang->truncate(
3541                                 str_replace("\n", ' ', $newtext),
3542                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3543                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3544                 }
3545
3546                 # Blanking autosummaries
3547                 if( $oldtext != '' && $newtext == '' ) {
3548                         return wfMsgForContent( 'autosumm-blank' );
3549                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3550                         # Removing more than 90% of the article
3551                         global $wgContLang;
3552                         $truncatedtext = $wgContLang->truncate(
3553                                 $newtext,
3554                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3555                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3556                 }
3557
3558                 # If we reach this point, there's no applicable autosummary for our case, so our
3559                 # autosummary is empty.
3560                 return '';
3561         }
3562
3563         /**
3564          * Add the primary page-view wikitext to the output buffer
3565          * Saves the text into the parser cache if possible.
3566          * Updates templatelinks if it is out of date.
3567          *
3568          * @param $text String
3569          * @param $cache Boolean
3570          */
3571         public function outputWikiText( $text, $cache = true ) {
3572                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3573
3574                 $popts = $wgOut->parserOptions();
3575                 $popts->setTidy(true);
3576                 $popts->enableLimitReport();
3577                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3578                         $popts, true, true, $this->getRevIdFetched() );
3579                 $popts->setTidy(false);
3580                 $popts->enableLimitReport( false );
3581                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3582                         $parserCache = ParserCache::singleton();
3583                         $parserCache->save( $parserOutput, $this, $popts );
3584                 }
3585                 // Make sure file cache is not used on uncacheable content.
3586                 // Output that has magic words in it can still use the parser cache
3587                 // (if enabled), though it will generally expire sooner.
3588                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3589                         $wgUseFileCache = false;
3590                 }
3591
3592                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3593                         // templatelinks table may have become out of sync,
3594                         // especially if using variable-based transclusions.
3595                         // For paranoia, check if things have changed and if
3596                         // so apply updates to the database. This will ensure
3597                         // that cascaded protections apply as soon as the changes
3598                         // are visible.
3599
3600                         # Get templates from templatelinks
3601                         $id = $this->mTitle->getArticleID();
3602
3603                         $tlTemplates = array();
3604
3605                         $dbr = wfGetDB( DB_SLAVE );
3606                         $res = $dbr->select( array( 'templatelinks' ),
3607                                 array( 'tl_namespace', 'tl_title' ),
3608                                 array( 'tl_from' => $id ),
3609                                 __METHOD__ );
3610
3611                         global $wgContLang;
3612                         foreach( $res as $row ) {
3613                                 $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3614                         }
3615
3616                         # Get templates from parser output.
3617                         $poTemplates = array();
3618                         foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3619                                 foreach ( $templates as $dbk => $id ) {
3620                                         $poTemplates["$ns:$dbk"] = true;
3621                                 }
3622                         }
3623
3624                         # Get the diff
3625                         # Note that we simulate array_diff_key in PHP <5.0.x
3626                         $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3627
3628                         if( count( $templates_diff ) > 0 ) {
3629                                 # Whee, link updates time.
3630                                 $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3631                                 $u->doUpdate();
3632                         }
3633                 }
3634
3635                 $wgOut->addParserOutput( $parserOutput );
3636         }
3637
3638         /**
3639          * Update all the appropriate counts in the category table, given that
3640          * we've added the categories $added and deleted the categories $deleted.
3641          *
3642          * @param $added array   The names of categories that were added
3643          * @param $deleted array The names of categories that were deleted
3644          * @return null
3645          */
3646         public function updateCategoryCounts( $added, $deleted ) {
3647                 $ns = $this->mTitle->getNamespace();
3648                 $dbw = wfGetDB( DB_MASTER );
3649
3650                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3651                 # exist, we might legitimately not create it, but it's simpler to just
3652                 # create it and then give it a negative value, since the value is bogus
3653                 # anyway.
3654                 #
3655                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3656                 $insertCats = array_merge( $added, $deleted );
3657                 if( !$insertCats ) {
3658                         # Okay, nothing to do
3659                         return;
3660                 }
3661                 $insertRows = array();
3662                 foreach( $insertCats as $cat ) {
3663                         $insertRows[] = array( 'cat_title' => $cat );
3664                 }
3665                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3666
3667                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3668                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3669                 if( $ns == NS_CATEGORY ) {
3670                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3671                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3672                 } elseif( $ns == NS_FILE ) {
3673                         $addFields[]    = 'cat_files = cat_files + 1';
3674                         $removeFields[] = 'cat_files = cat_files - 1';
3675                 }
3676
3677                 if( $added ) {
3678                         $dbw->update(
3679                                 'category',
3680                                 $addFields,
3681                                 array( 'cat_title' => $added ),
3682                                 __METHOD__
3683                         );
3684                 }
3685                 if( $deleted ) {
3686                         $dbw->update(
3687                                 'category',
3688                                 $removeFields,
3689                                 array( 'cat_title' => $deleted ),
3690                                 __METHOD__
3691                         );
3692                 }
3693         }
3694 }